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On March 3, 2020, a super cell makes it way across Kentucky and sets its sights on Tennessee; that night, 10 tornados ranging from EF0 to EF4 touched down in Tennessee, leaving approximately $1.6 billion in damage and taking 25 lives.

Inspect a rusty boat in Florida that once held boundless treasure; creep around an Indiana house of correction that punished its residents; examine a metal menagerie on the front lines of a foreign attack and an upstate New York comedy incubator.

Figuring out who's the creator of a 5,000-year-old carved stone object covered in markings; examining why people believed an electrocution device could cure them.

Motorcyclists film a bizarre, elongated humanoid creature walking along a road in Jharkhand, India; experts investigate the violent history behind an organized cult of professional robbers and murderers who targeted unsuspecting travelers.

Scramble as the staff tries to find a place for each of the orphaned skunks, raccoons, and groundhogs that are streaming through the rehab's doors. Then deal with the deadly side of spring as the team tries to save a hare wounded by a weed whacker.

Check in with the Holmes team as they make upgrades to Linda and Stuart's home that will help Linda get back to life after a surprise leg amputation. Feel the relief as they create wheelchair-accessible spaces and remove barriers to her independence.

A vanished Neolithic structure in an Irish farmer's field, an ancient oasis in the remote reaches of a Chinese desert, a centuries-old buried treasure in the UK and a dreaded predator in the Pacific Ocean are discovered by accident using drones.

A Nazi weapon designed to turn the tides of WWII in Northern France; a secret Russian military tower in the shadow of the Chernobyl disaster; a forgotten Australian tunnel rumored to hide a nuclear lab; something shocking buried under Alcatraz.

Over a hundred massive concrete arrows scattered across America; a giant chalk figure with an oversized phallus on an English hillside; a mysterious hole in the middle of a lake in Southern California.

A Turkish drought reveals a long-lost ancient Basilica and its secrets; a church spire punches through the surface of a toxic sludge in Romania; the hull of a massive ship in the North Sea answers decades old questions.

Nubian pyramids reveal the rise of female power in Ancient Kush; a shocking satellite image uncovers secrets of an ancient ancestral Puebloan site in New Mexico.

With the house unfinished, a contractor flees with almost $200,000 of a couple's money and they are now forced to live in a motor home on their front driveway.

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On March 3, 2020, a super cell makes it way across Kentucky and sets its sights on Tennessee; that night, 10 tornados ranging from EF0 to EF4 touched down in Tennessee, leaving approximately $1.6 billion in damage and taking 25 lives.

Classic Corvettes are sucked underground by a sinkhole; a catastrophic oil collision causes an inferno of epic proportions; bridge construction in Spain comes crashing down; an explosion in North Carolina; a massive dam failure in Texas.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

The world's strangest ghost towns are home to dark secrets, creepy buildings and eerie sights; new discoveries reveal why they were abandoned.

Balancing on a knife's edge as a crucial bridge is left hanging over a canyon on California's Pacific Coast Highway; a high-speed train disaster in Germany; a Vegas casino inferno; a sinking feeling in an Australian apartment building.

The world's strangest ghost towns are home to dark secrets, creepy buildings and eerie sights; new discoveries reveal why they were abandoned.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Skiers get trapped by a massive avalanche; cars careen on icy roads; storm chasers escape a tornado; a violent volcanic eruption turns day into night.

Exploring the stories behind mankind's greatest engineering disasters through archives and expert interviews.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Skiers get trapped by a massive avalanche; cars careen on icy roads; storm chasers escape a tornado; a violent volcanic eruption turns day into night.

Exploring the stories behind mankind's greatest engineering disasters through archives and expert interviews.

The coastal metropolis of Miami faces a triple threat of crumbling limestone bedrock, ferocious superstorms and relentless rising oceans.

The world's strangest ghost towns are home to dark secrets, creepy buildings and eerie sights; new discoveries reveal why they were abandoned.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

Phil Risko's team at Northstar works fast to refloat a trawler that's been blown onto the shore of a national park in New Jersey; the team improvises to get it back to sea before it suffers further damage.

At the mouth of the Suez Canal, Lino Arosemena and his crew have a monster repair job of removing and refitting a 20-ton propeller.

Veteran salvor Paul Hay and his team rescue a clam-dredging crew's harvest lost in a storm off the New Jersey coast; following an annual cleanup operation in New Zealand that salvages fishing equipment gone astray.

Capt. John Ward and his crew are called to raise a sunken houseboat near Pensacola, Fla.; the owner of the boat wants it back, but the current occupiers of the boat living in it don't want John's services; there've been reports of gunfire too.

John Ward and his crew are called to salvage a massive barge upturned by a storm in a canal; Hickory Scuba Divers work to salvage a valuable sailboat that's sunk at its mooring.

Savannah balances the medical needs of animals with the emotional bonds of the owners.

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A huge black ring hovers silently over remote prairie land; a perfectly paved yellow highway exists at the bottom of deep ocean; a hiker appears to miraculously levitate above a rocky landscape.

Satellite images capture a mysterious fortification concealed beneath a patch of woodland in the remote stretches of Norfolk, England; experts investigate rival royal families and a lost castle that was destroyed during a medieval blood feud.

A forgotten military fortification connected to a network of secret tunnels are mysteriously hidden within the Rock of Gibraltar; experts investigate and uncover a derelict war-torn complex constructed for a highly classified WWII spy operation.

A bizarre top-secret facility; haunting underground caverns; a formidable ring of battered fortifications; other-worldly structures hovering over water.

Following the debate about Egypt's visionary warrior king, who ruled the country for more than 60 years; learning why scholars can't pin down the origin of his wife, Nefertiti and dig into the strange circumstances surrounding his death at age 90.

Aiming high to see what brought down an iconic space telescope in Puerto Rico and a high-rise construction project in Virginia; looking into the mysterious destruction of a U.K. roadway; watching a ship topple a bridge in the U.S. state of Georgia.

A bizarre top-secret facility; haunting underground caverns; a formidable ring of battered fortifications; other-worldly structures hovering over water.

Scattered across the United States are abandoned structures, forgotten ruins of the past and monuments to a bygone era that reveal the secrets of a hidden America.

Observe a pair of white, piebald fawns that pose a big rehab challenge. Check out an albino skunk displaced by flash floods, see Dr. Mikaela race to save a parasite-infected chipmunk, and monitor a groundhog fighting for its life after a dog attack.

Dr. Emma Jackson takes on a new role at one of Calgary's busiest animal rescue shelters; Dr. Allison's love for cats shines through as she provides emergency surgery on an ageing cat with a broken leg.

Dr. Cori puts on a smile for her least favorite job, cow pregnancy testing; Dr. Allison treats an orange cat with a skin condition and uses a musical trick to calm the nerves of a soon-to-be neutered dog.

Celebrate with Rachael and Robin as the Holmes team reworks their new bungalow to make life brighter for their daughter, Bree, who was born with trisomy 13. Check out this three-year-old survivor's first-ever bedroom and tons of accessible features.

Observe a pair of white, piebald fawns that pose a big rehab challenge. Check out an albino skunk displaced by flash floods, see Dr. Mikaela race to save a parasite-infected chipmunk, and monitor a groundhog fighting for its life after a dog attack.

Dr. Emma Jackson takes on a new role at one of Calgary's busiest animal rescue shelters; Dr. Allison's love for cats shines through as she provides emergency surgery on an ageing cat with a broken leg.

Dr. Cori puts on a smile for her least favorite job, cow pregnancy testing; Dr. Allison treats an orange cat with a skin condition and uses a musical trick to calm the nerves of a soon-to-be neutered dog.

Celebrate with Rachael and Robin as the Holmes team reworks their new bungalow to make life brighter for their daughter, Bree, who was born with trisomy 13. Check out this three-year-old survivor's first-ever bedroom and tons of accessible features.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

A bizarre top-secret facility; haunting underground caverns; a formidable ring of battered fortifications; other-worldly structures hovering over water.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

The downfall of the powerful Maya city of Palenque continues to mystify archaeologists today; now, investigators gain rare access to explore lost tombs to reveal the truth behind this legendary city and the mystery behind its enigmatic queens.

A journey down Spain's Guadalquivir River, from the high Sierra de Cazorla down to Andalusia; passing through Cordoba and Seville, following the footsteps of Columbus and Magellan.

Discover the stories of six epic river journeys via the fascinating characters who live and work on and around the water.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

Escape with us on a thrilling journey down the river that forged North America ... the St. Lawrence. From the grandeur of the Great Lakes to the picturesque 1000 Islands and through the vibrant, historic cities of Montreal and Quebec. Past rugged landscapes and into the world's largest estuary. To sailors, kayakers and whale watchers the river is part playground, part paradise. Sailing by castles, diving for shipwrecks and rowing the open water.

Paid programming.

Two groups of strangers are dropped deep into the mountains of British Columbia; with no modern technology, the group struggles to build shelter and live the way their ancestors have since time immemorial.

Exploring the stories behind mankind's greatest engineering disasters through archives and expert interviews.

Reflect on the collapse of this mighty South American society; contemplate how the technologically advanced Inca Empire, which stretched from Ecuador to Chile, was swiftly dismantled and how the evidence of its existence was nearly lost to history.

Skiers get trapped by a massive avalanche; cars careen on icy roads; storm chasers escape a tornado; a violent volcanic eruption turns day into night.

The ruins of a once-palatial compound contain the secrets of one of history's most notorious criminals, and new discoveries reveal why this high-security estate was built and why it was abandoned.

Scientists, historians and archeologists attempt to unravel mysteries of history.

New York residents get a rude awakening when a disastrous crane collapse causes chaos on the downtown streets of Manhattan; experts use the latest tech to investigate and reveal how a slight increase in wind conditions created major catastrophe.

The ruins of a once-palatial compound contain the secrets of one of history's most notorious criminals, and new discoveries reveal why this high-security estate was built and why it was abandoned.

The downfall of the powerful Maya city of Palenque continues to mystify archaeologists today; now, investigators gain rare access to explore lost tombs to reveal the truth behind this legendary city and the mystery behind its enigmatic queens.

A giant ice stack on a remote lake spouts a strange vapor, dazzling jeweled objects litter a dank cave floor and a man's shout causes a lake to bizarrely react with thousands of ripples.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Skiers get trapped by a massive avalanche; cars careen on icy roads; storm chasers escape a tornado; a violent volcanic eruption turns day into night.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

A giant ice stack on a remote lake spouts a strange vapor, dazzling jeweled objects litter a dank cave floor and a man's shout causes a lake to bizarrely react with thousands of ripples.

The ruins of a once-palatial compound contain the secrets of one of history's most notorious criminals, and new discoveries reveal why this high-security estate was built and why it was abandoned.

A villager films a river bank suddenly rising as though a gigantic creature is emerging from beneath the waters in India; experts investigate a potential network of criminal gangs who may be stripping river beds of a very valuable commodity.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

Kim and Pierre's trapping season is complicated by a troublesome local resident; Becky enlists her dog team to help secure a supply of firewood. Pike Mike hunts for small game; Bentley teaches his young nephew the tricks of the trapping trade.

Pike Mike tries to improvise a new source of bush power; Kim and Pierre are forced to exploit their survival food supply; Becky and Bentley hit the hunting trail, hoping to harvest an animal that will keep their families fed all winter long.

Becky makes a last-ditch effort to harvest a Muskox; Unrelenting snow forces Kim and Pierre to upgrade their shelter; Desperate for a successful fur season, Bentley works his trapline; Caught in a deep-freeze, Mike searches for a source of water.

In search of a steady supply of dog food, Becky and family establish a Fish Camp on Great Slave Lake; Kim and Pierre work on a new shelter; Bentley and new comer Jon Grenier attempt to secure essential sources of meat before winter sets in.

Becky and Dene make upgrades to their new homestead; Kim and Pierre look to the land for a source of emergency food; Bentley tries his hand at some early season trapping; Jon takes to the sea in his on-going quest to pad his winter larder.

Paid programming.

Mike arrives and they rebuild the terrace with a proper watertight membrane and new decking.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

A giant ice stack on a remote lake spouts a strange vapor, dazzling jeweled objects litter a dank cave floor and a man's shout causes a lake to bizarrely react with thousands of ripples.

The ruined home of a famous outlaw; cottages concealing an explosive secret; towers in a hellish landscape; alien-like structures with no apparent purpose.

Scientists, historians and archeologists attempt to unravel mysteries of history.

Shock in Pennsylvania, as a vital bridge crashes to the ground.

The ruined home of a famous outlaw; cottages concealing an explosive secret; towers in a hellish landscape; alien-like structures with no apparent purpose.

Mapping the zigzagging path of a floating palace as it ferries U.S. troops to Europe during World War II; witnessing her smooth transition to peacetime cruise ship and mourning her disastrous end after she was sold to a Hong Kong shipping tycoon.

Reflect on the collapse of this mighty South American society; contemplate how the technologically advanced Inca Empire, which stretched from Ecuador to Chile, was swiftly dismantled and how the evidence of its existence was nearly lost to history.

Discover 10 perfectly preserved Byzantine-era crocodiles on the banks of the Nile. Untangle the puzzle of the Namib Desert's grass circles, locate the remnants of a lost foreign-ruled city in Egypt, and solve the riddle of Peru's Band of Holes.

Examining how an injured skull changed the face of neuroscience; determining if World War 2 had been won by a bat; figuring out if people were making sophisticated multipurpose tools 14,000 years ago.

Reflect on the collapse of this mighty South American society; contemplate how the technologically advanced Inca Empire, which stretched from Ecuador to Chile, was swiftly dismantled and how the evidence of its existence was nearly lost to history.

Discover 10 perfectly preserved Byzantine-era crocodiles on the banks of the Nile. Untangle the puzzle of the Namib Desert's grass circles, locate the remnants of a lost foreign-ruled city in Egypt, and solve the riddle of Peru's Band of Holes.

A villager films a river bank suddenly rising as though a gigantic creature is emerging from beneath the waters in India; experts investigate a potential network of criminal gangs who may be stripping river beds of a very valuable commodity.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

The ruined home of a famous outlaw; cottages concealing an explosive secret; towers in a hellish landscape; alien-like structures with no apparent purpose.

Exploring the stories behind mankind's greatest engineering disasters through archives and expert interviews.

Examining how an injured skull changed the face of neuroscience; determining if World War 2 had been won by a bat; figuring out if people were making sophisticated multipurpose tools 14,000 years ago.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

The view from above reveals; baffling behaviour from one of the ocean's fastest fish; whales with a strange, aquatic accessorizing habit; a confounding congregation of sharks down under; and a perplexing collection of circles decorating the seabed.

The view from above reveals; a derelict complex of pod-like structures with seemingly alien origins; a bewildering concrete construction in the mountains of Bosnia; a puzzling collection of out of place shapes discarded in the wilds of Greenland.

Zoom in on some otherworldly sights. Spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn, and take a spin around a doughnut-shaped lake in Saskatchewan.

Explore strongholds abandoned by their architects. Look at a lost city in the Amazon jungle, see a desert fortress made by humanity's most notorious empire, explore a city of identical castles, and examine a Greek isle's bloody history from the air.

A villager films a river bank suddenly rising as though a gigantic creature is emerging from beneath the waters in India; experts investigate a potential network of criminal gangs who may be stripping river beds of a very valuable commodity.

An analysis of the secrets of long-lost human settlements, a mysterious Norwegian mound, pre-historic stone circle on the banks of the Tagus River, lost city in the cradle of civilization and more.

Discover 10 perfectly preserved Byzantine-era crocodiles on the banks of the Nile. Untangle the puzzle of the Namib Desert's grass circles, locate the remnants of a lost foreign-ruled city in Egypt, and solve the riddle of Peru's Band of Holes.

The downfall of the powerful Maya city of Palenque continues to mystify archaeologists today; now, investigators gain rare access to explore lost tombs to reveal the truth behind this legendary city and the mystery behind its enigmatic queens.

A spiraling structure leading to the unknown; a devastated mountaintop mansion; a vast rusting relic in the woods; crumbling towers on the edge of the earth.

Scientists, historians and archeologists attempt to unravel mysteries of history.

In Nebraska, a dam goes up against mother nature; tragedy in Germany, as an alpine ice rink roof collapses in seconds; a toxic wave washes through a community; one of the world's biggest bridges crashes to earth in Canada.

A spiraling structure leading to the unknown; a devastated mountaintop mansion; a vast rusting relic in the woods; crumbling towers on the edge of the earth.

Discover 10 perfectly preserved Byzantine-era crocodiles on the banks of the Nile. Untangle the puzzle of the Namib Desert's grass circles, locate the remnants of a lost foreign-ruled city in Egypt, and solve the riddle of Peru's Band of Holes.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

A huge black ring hovers silently over remote prairie land; a perfectly paved yellow highway exists at the bottom of deep ocean; a hiker appears to miraculously levitate above a rocky landscape.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

A giant ice stack on a remote lake spouts a strange vapor, dazzling jeweled objects litter a dank cave floor and a man's shout causes a lake to bizarrely react with thousands of ripples.

Mapping the zigzagging path of a floating palace as it ferries U.S. troops to Europe during World War II; witnessing her smooth transition to peacetime cruise ship and mourning her disastrous end after she was sold to a Hong Kong shipping tycoon.

Hollywood actor Peter Stormare and Elroy Balgaard investigate new leads; when they meet a Native American professor who provides new information, they realize they must expand their investigation to the East Coast.

A spiraling structure leading to the unknown; a devastated mountaintop mansion; a vast rusting relic in the woods; crumbling towers on the edge of the earth.

A villager films a river bank suddenly rising as though a gigantic creature is emerging from beneath the waters in India; experts investigate a potential network of criminal gangs who may be stripping river beds of a very valuable commodity.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

The clifftop ruins of Tintagel Castle are shrouded in a tumultuous history and believed to be the birthplace of King Arthur; experts use cutting-edge tech to unlock the secrets of this ancient structure and reveal the truth behind a legendary ruler.

The ancient city of Samarra contains a series of medieval structures that hold secrets to one of the world's greatest empires; archaeologists use pioneering technology to investigate its astonishing rise to power and reveal its monumental downfall.

The coliseums of Rome were brutal theaters of spectacle and death that helped control the sprawling Roman empire; now, archaeologists uncover the engineering secrets behind these majestic structures to reveal the truth behind the ancient Roman world.

Paid programming.

Six people embark on a journey in the footsteps of their ancestors from Elders and knowledge keepers.

The legendary metropolis of Xanadu and its fabled existence have mystified experts for centuries; archaeologists use cutting-edge aerial imaging to investigate new discoveries and reveal the truth behind this mythical lost city.

The latest discoveries at cutting-edge archaeological excavations shed new light on the lost cities of the Bible, and using hi-tech investigative methods, experts are rethinking everything they know about these ancient worlds.

Satellite images capture a mysterious fortification concealed beneath a patch of woodland in the remote stretches of Norfolk, England; experts investigate rival royal families and a lost castle that was destroyed during a medieval blood feud.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Reflect on the collapse of this mighty South American society; contemplate how the technologically advanced Inca Empire, which stretched from Ecuador to Chile, was swiftly dismantled and how the evidence of its existence was nearly lost to history.

Observe a pair of white, piebald fawns that pose a big rehab challenge. Check out an albino skunk displaced by flash floods, see Dr. Mikaela race to save a parasite-infected chipmunk, and monitor a groundhog fighting for its life after a dog attack.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

A forgotten military fortification connected to a network of secret tunnels are mysteriously hidden within the Rock of Gibraltar; experts investigate and uncover a derelict war-torn complex constructed for a highly classified WWII spy operation.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Examining how an injured skull changed the face of neuroscience; determining if World War 2 had been won by a bat; figuring out if people were making sophisticated multipurpose tools 14,000 years ago.

Mapping the zigzagging path of a floating palace as it ferries U.S. troops to Europe during World War II; witnessing her smooth transition to peacetime cruise ship and mourning her disastrous end after she was sold to a Hong Kong shipping tycoon.

Discover 10 perfectly preserved Byzantine-era crocodiles on the banks of the Nile. Untangle the puzzle of the Namib Desert's grass circles, locate the remnants of a lost foreign-ruled city in Egypt, and solve the riddle of Peru's Band of Holes.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

Scattered across the United States are abandoned structures, forgotten ruins of the past and monuments to a bygone era that reveal the secrets of a hidden America.

The coastal metropolis of Miami faces a triple threat of crumbling limestone bedrock, ferocious superstorms and relentless rising oceans.

The downfall of the powerful Maya city of Palenque continues to mystify archaeologists today; now, investigators gain rare access to explore lost tombs to reveal the truth behind this legendary city and the mystery behind its enigmatic queens.

A vital Mississippi River interstate crossing is discovered to be in danger of imminent collapse in Memphis; experts use the latest science to investigate and uncover severely compromised load-bearing tension members with a life-threatening weakness.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

Hollywood actor Peter Stormare and Elroy Balgaard investigate new leads; when they meet a Native American professor who provides new information, they realize they must expand their investigation to the East Coast.

New York City is under attack as Hurricanes Ida and Ian unleash their fury on innocent people; seeing how the latest science and technology can protect New York City's 8 million residents before everything gets swept away by ferocious superstorms.

New York City is under attack as Hurricanes Ida and Ian unleash their fury on innocent people; seeing how the latest science and technology can protect New York City's 8 million residents before everything gets swept away by ferocious superstorms.

The West Coast is home to the San Andreas fault, stretching for almost a thousand miles beneath the feet of millions of Americans.

The West Coast is home to the San Andreas fault, stretching for almost a thousand miles beneath the feet of millions of Americans.

The coastal metropolis of Miami faces a triple threat of crumbling limestone bedrock, ferocious superstorms and relentless rising oceans.

Skiers get trapped by a massive avalanche; cars careen on icy roads; storm chasers escape a tornado; a violent volcanic eruption turns day into night.

Reflect on the collapse of this mighty South American society; contemplate how the technologically advanced Inca Empire, which stretched from Ecuador to Chile, was swiftly dismantled and how the evidence of its existence was nearly lost to history.

Observe a pair of white, piebald fawns that pose a big rehab challenge. Check out an albino skunk displaced by flash floods, see Dr. Mikaela race to save a parasite-infected chipmunk, and monitor a groundhog fighting for its life after a dog attack.

Examining how an injured skull changed the face of neuroscience; determining if World War 2 had been won by a bat; figuring out if people were making sophisticated multipurpose tools 14,000 years ago.

A forgotten military fortification connected to a network of secret tunnels are mysteriously hidden within the Rock of Gibraltar; experts investigate and uncover a derelict war-torn complex constructed for a highly classified WWII spy operation.

Celebrate with Rachael and Robin as the Holmes team reworks their new bungalow to make life brighter for their daughter, Bree, who was born with trisomy 13. Check out this three-year-old survivor's first-ever bedroom and tons of accessible features.

Using cutting-edge CGI, archive footage and expert interviews, examine mysterious curiosities that have been uncovered by extreme weather and calamitous incidents.

Exploring the stories behind mankind's greatest engineering disasters through archives and expert interviews.

Alaskans must overcome rising waters to capitalize on spring's offerings.

An extensive look into an active cold case investigation involving an unexplained crash in Roswell, N.M., in the summer of 1947; updated eyewitness accounts and expert interviews.

Puzzle over an out-of-place relic from World War II and get a bird's-eye view of stone circles in Norway; examine mysterious, ancient mounds on the banks of the Mississippi and uncover the dark history of a medieval English village.

Scattered across the United States are abandoned structures, forgotten ruins of the past and monuments to a bygone era that reveal the secrets of a hidden America.

Sign off.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Scattered across the United States are abandoned structures, forgotten ruins of the past and monuments to a bygone era that reveal the secrets of a hidden America.

Examining how an injured skull changed the face of neuroscience; determining if World War 2 had been won by a bat; figuring out if people were making sophisticated multipurpose tools 14,000 years ago.

A villager films a river bank suddenly rising as though a gigantic creature is emerging from beneath the waters in India; experts investigate a potential network of criminal gangs who may be stripping river beds of a very valuable commodity.

Observe a pair of white, piebald fawns that pose a big rehab challenge. Check out an albino skunk displaced by flash floods, see Dr. Mikaela race to save a parasite-infected chipmunk, and monitor a groundhog fighting for its life after a dog attack.

Celebrate with Rachael and Robin as the Holmes team reworks their new bungalow to make life brighter for their daughter, Bree, who was born with trisomy 13. Check out this three-year-old survivor's first-ever bedroom and tons of accessible features.

Strange markings in the remote reaches of Northern Finland; drones find a Manhattan-sized mystery in the depths of a Vietnamese cave; secrets are no longer hidden in the Antarctic; a lost sky-high world in Mozambique gets a visit from above.

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle; clues to what killed a once-vibrant Pennsylvania mining town; an aerial glimpse of New York's forgotten ghost town; an Italian Renaissance reduced to dust.

As seen from space, a crater in Turkmenistan, is on fire; drones reveal perfect circles in the Namibian desert; A puzzle is solved by a World War 2 code breaker; Mystery of Death Valley's self-moving stones; Utah's strange electric blue ponds.

A remote island linked to one of the world's most famous aviation mysteries; thousands of shipwrecks in the Bermuda triangle; a history lost and found in the South Pacific; a 10,000-year-old mystery in the murky depths of the Yucatan Peninsula.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

A townhouse built on the foundation of an old church proves difficult when it comes to regulating the temperature.

Paid programming.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

A series of violent explosions rips through a major Texas oil refinery, causing a fatal disaster and devastation on a terrifying scale; experts use the latest science to investigate and uncover what triggered a catastrophic malfunction.

Analyze fish remains found near an angry Sumatran volcano that could suggest a new human migration route. Visit a prehistoric village smoked out by a forest fire, a collapsed kingdom in Turkey, and evidence of early Olympic sacrificial rituals.

A concrete cavern protecting a tyrant; a complex at the ends of the earth; a rocky bay covered with bizarre remains; the ruins of a ruthless regime's prototype.

A frozen lake deep in the Himalayas melts once a year to expose hundreds of human bones and a centuries-old mystery of astonishing carnage; leaving experts to speculate if it was a single catastrophic event or something much more sinister.

In Glasgow, towering flames gut a national treasure. Catastrophe in New Zealand, as flooding devastates a farming community. Tragedy in Texas, after a fatal leak at a chemical plant. And in Nebraska, why did disaster strike on a titanic TV tower?