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When a perfect triangle is found in the middle of a unpopulated portion of Australia, experts begin to wonder whether or not the design is man made.
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What on Earth?
Strange Australian Triangle
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Satellite photos show a strange circle beneath the ice of an ancient lake. Further analysis shows that these mysterious rings appear each year. What are they?
03:58
What on Earth?
Intriguing Ice Circle
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A satellite captures an image that uncovers the entrance to an underground complex. What is being built there?
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What on Earth?
Chinese Underground Lair
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Scientists are baffled when a seemingly huge tsunami headed straight for Hong Kong suddenly disappears in the water.
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What on Earth?
Huge Tsunami or Marine Weapon?
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Sandy Island seems to have disappeared, and scientists aren't quite sure why. Was there some sort of elaborate government experiment?
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What on Earth?
Missing Island
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Satellite images capture a distinct glowing object beneath the ocean's surface.
03:18
What on Earth?
Mysterious Underwater Glow
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Satellite images reveal a strange hole in Antarctica. After scientists rule out whirlpools and sinkholes, they have to look back in time to find the answer.
02:55
What on Earth?
Ghost Lakes in Antarctica
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A commercial satellite imager spots something strange in the middle of a vast desert. It looks like an airport runway, but there are no planes. No government claims ownership of this strange place.
03:01
What on Earth?
Secret Drone Hangar Discovered in Saudi Arabia
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Satellite images reveal enormous spirals in Peru. Some researchers say they are too perfect and too huge to be man made.
00:45
What on Earth?
Strange Spirals in Peru
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Ghost lakes have existed for millions of years, but they just recently started showing themselves. Geophysicist Helen Fricker explains how scientists are moving forward with this discovery.
01:26
What on Earth?
Discovering Ghost Lakes
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For years the hottest place on Earth ever recorded was a city in Libya. When researchers took a second look at this information, they realized the measurement was wrong.
01:27
What on Earth?
The Hottest Place on Earth
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When you think of deserts, you don't typically think of bright, jewel tones. Why are these massive pools of color here?
02:04
What on Earth?
Why is this Desert so Colorful?
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Who drew this over 2 mile long humanoid figure into the Australian terrain?
02:12
What on Earth?
This Humanoid Drawing can be Seen From Space
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Satellite images revealed hundreds of black holes in the middle of the desert near ancient burial grounds. Is grave robbing still a thing in modern day or were these holes caused by something else?
00:46
What on Earth?
Black Holes in Egypt
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Satellites spotted a strange, long streak across the desert in Bolivia. At first, scientists thought it may be a skid mark from a meteor.
02:09
What on Earth?
Train Graveyard in Bolivia
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This isn’t an optical illusion. This lake on Middle Island is actually pink! You can thank the algae in the lake for the gorgeous color.
03:12
What on Earth?
This Lake is Bright Pink
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This romantic road carved into a sheer rock face in the Rhone Valley in France was an engineering marvel that was once a wild success. What caused it to be abandoned today?
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Meet the Most Dangerous Wooden Railroad
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Two miles inside a mountain in Croatia lies the remains of a massive, secret Cold War airbase built to withstand a nuclear war.
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Now abandoned, this machine once could scan thousands of kilometers.
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Virtually Visit a Top Secret Chernobyl Complex
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Explore the mystery behind why a huge gun was built and abandoned.
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Explore the Harp Supergun
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Hidden in woods outside Moscow is a Cold War weapon that harnessed electricity into a thunderbolt, designed to protect the city.
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The Lightning Bolt Weapon
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In the east China sea, there is an abandoned piece of land. Check out why this island represents one of the greatest engineering achievements of the 20th century.
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Why is This Island Abandoned?
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Located in California, Plank Road is one of the most extraordinary engineering achievements of the early 20th century.
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Virtually Drive Across the Famous Plank Road
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Philip Grossman finds firefighting gear under a hospital in Chernobyl, sending his Geiger counter climbing. He believes burying the gear was the Soviet’s attempt to hide the scope of the disaster.
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Cover Up in the Hospital
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Philip Grossman goes inside the plant near the massive radio tower he finds maps of the U.S and pictures of mushroom clouds. Was the Duga for protecting Chernobyl from incoming missiles or part of a nuclear offensive?
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The Duga - Entwined with Chernobyl's Fate
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Survivors who worked at nearby factory report production areas they weren’t allowed to visit. Philip visits and finds the basement full of lab after lab of gas masks, radioactive testing materials and sand.
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The Jupiter Factory's Hidden Laboratories
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Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.
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Alien Encounters
Frank Drake and Nick Sagan Meet Again
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What would receiving a message from an alien civilization tell us about human evolution, and about surviving the most serious problems facing our planet?
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Alien Encounters
Humanity's Evolutionary Outcome
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Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.
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Nick Sagan & Frank Drake Reunite
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