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More from this Show
Astronomy was incredibly important to the ancient Maya. In particular, they tracked the movements of planet Venus, the sun, and the moon.
02:27
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The Maya Used This Observatory to Predict Death and Harvest
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El Castillo or the Temple of Kukulcan is 98 feet tall and has 365 steps. What you can't see from the outside is the original, much smaller pyramid that acted as a foundation.
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Chichen Itza's Famous Pyramid is Actually Two Pyramids
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How did they get those huge blocks to the top of pyramids? There have been many speculations, but the most likely scenario involves intricate ramps.
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Ancient Egyptians Used This Method to Build Tall Structures
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The Great Pyramid of Giza was the tallest structure on Earth for more than 3,500 years! Workers had to cut and lay more than 200 blocks a day in order to meet their deadline.
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How Did Ancient Egyptians Build Pyramids Quickly?
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Tourists commonly ask why the Great Wall follows a seemingly random path. The answer is intimidation and military strategy.
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Why Isn't the Great Wall of China Built in a Straight Line?
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The first Great Wall was built from mud and reeds over 2,000 years ago. As warfare developed, the wall had to be improved and strengthened.
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The Original Great Wall of China
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Restoration jobs are supposed to help fix a building, but a few hundred iron clamps did the opposite on one of the world's most well known buildings. The marble is now detaching and breaking.
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A Restoration Job Actually Made the Parthenon Worse
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A complex ramp was used to move the enormous marble blocks up to the Acropolis. Some of the largest blocks weigh over 10 tons.
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How Did Ancient Greeks Build the Parthenon?
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Cologne Cathedral, Germany's most visited landmark, attracts an average of 20,000 people a day. Construction of the building started in 1248, but was stopped in 1473, leaving it unfinished until work restarted in the 19th century.
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The Cologne Cathedral Took Over 600 Years to Build
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The Shrine of Three kings inside the church is believed to hold the remains of the Three Wise Men, whose relics were acquired during the conquest of Milan in 1164. It's only one of many stunning features within the cathedral.
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Cologne Cathedral Supposedly has the Bones of the Three Wise Men
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Open fires were once used to heat the 1,000+ rooms in the Houses of Parliament. Engineers relied on an intense spire chimney to filter out all the smoke.
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Westminster Palace's Chimney has an Air Current Faster than Modern AC
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When parliament commissioned this clock in 1854, they insisted Big Ben be the biggest, most powerful clock in the world. It takes an hour and a half to wind this massive engineering marvel!
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How Does Big Ben Keep Accurate Time?
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Treasures provide clues about the mysterious rulers of Teotihuacan.
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Relics from the Pyramid of the Feathered Serpent
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See inside the secret tomb beneath the Pyramid of the Feathered Serpent.
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A Teotihuacan Pyramid Hides the Skeletons of Human Sacrifices
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See how the Sphinx originally appeared, and how it demonstrated the power of the pharaoh Khafre.
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The Face Behind the Great Sphinx of Giza
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Clues reveal what the Sphinx Temple looked like more than 4,000 years ago, and its secret ties to the yearly equinoxes.
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Secrets of the Sphinx Temple
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See inside the famous Indian monument as never before.
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The Perfect Beauty of the Taj Mahal
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Despite being in a Hindu country, the Taj features a great deal of Muslim symbolism.
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Religion and Power at the Taj Mahal
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See how the majestic stadium looked 1,900 years ago.
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The Colosseum in its Original Glory
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The arena where gladiators trained, and how they made their grand entrance into the Colosseum.
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Ludus Magnus: The Gladiator School
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Discover what the relics of an oasis reveal about the fall of the civilization that built Petra.
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Oasis Ruins and Petra's Collapse
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Since the 1960s, NASA has been keeping an eye on man-made objects in space. Here, engineers are replicating the devastating impact of space debris. 'Alien Encounters' airs Tuesdays at 10/9c.
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Alien Encounters
The Effects of Space Trash Can Be Devastating... and Deadly
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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.
02:31
Alien Encounters
Frank Drake and Nick Sagan Meet Again
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Since launching in 2009, the Kepler program has detected hundreds of previously unknown planets. How many of them are Earth-like, and what does that mean for the probability of intelligent life beyond our solar system?
02:05
Alien Encounters
Do Billions of Planets Mean More Earths?
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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?
01:35
Alien Encounters
Humanity's Evolutionary Outcome
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If the chirality of aliens is different than ours, it couldn't interact with us, and therefore would be non threatening.
02:12
Alien Encounters
Sinistral Intentions
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An alien spacecraft might not rely solely on sunlight to power its trajectory. Find out what other energy technology aliens could use to travel through the universe.
01:30
Alien Encounters
Space-Powered Alien Ship
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Will ETs look like us? Will they resemble giant insects? Scientists debate how various environments could have created life forms beyond our wildest imagination.
01:49
Alien Encounters
Will Aliens Have Bodies?
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It's possible that life on earth began off-planet and spread here.
02:42
Alien Encounters
Panspermia
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It's likely that an advanced civilization would combine the advantages of a machine with the advantages of biological systems.
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Alien Encounters
The Hybrid
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Deep sea diving is more dangerous than the movies make it seem. Find out how professional divers are trained to handle any situation.
03:45
How Do They Do It?
Training Deep Sea Divers
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Have you ever wondered how sushi is caught? From the sea to your restaurant table, catching sushi has become not only a delicacy but a difficult job.
03:11
How Do They Do It?
Sushi from Sea to Table
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