Astronomy was incredibly important to the ancient Maya. In particular, they tracked the movements of planet Venus, the sun, and the moon.

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.

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.

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.

Tourists commonly ask why the Great Wall follows a seemingly random path. The answer is intimidation and military strategy.

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.

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.

A complex ramp was used to move the enormous marble blocks up to the Acropolis. Some of the largest blocks weigh over 10 tons.

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.

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.

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.

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!

The elaborate defenses of Egyptian tombs - and how clever thieves got around them.

Take a virtual tour of the final resting place of the boy king.

Treasures provide clues about the mysterious rulers of Teotihuacan.

See inside the secret tomb beneath the Pyramid of the Feathered Serpent.

See inside the famous Indian monument as never before.

Despite being in a Hindu country, the Taj features a great deal of Muslim symbolism.

See how the majestic stadium looked 1,900 years ago.

The arena where gladiators trained, and how they made their grand entrance into the Colosseum.

Discover what the relics of an oasis reveal about the fall of the civilization that built Petra.

Les journeys to a remote community in British Columbia where sightings of the Bukwas, or Sasquatch, are common and belief in the creature is a given not a myth.

For the first time, Les Stroud takes a fan into the wilderness to survive alongside him. He starts with a surprise…Joseph McConnell gets only two survival items to take with him.

Les shows how to build a fire with the most basic items someone might take on a hike. His goal is to survive a cold Oregon night like a family did in a real-life survival story.

Les makes his own fishing gear. Will he catch dinner?

Les is recreating the story of a family lost in the Oregon woods. He's recreating it with a "surrograte family" who help him create a warm cocoon of bedding from ferns.

Les uses a found lighter, wood and a rubber shoe to build a fire.

Les picks up Joe after leaving him alone for a night with only two items. He hopes Joe has been motivated by his experience to start learning survival skills from what he hears and observes.

As Les prepares to venture up a trail that has had reported sightings of the Bukwas, he finds an interesting and inexplicable display of bones and flattened grass.

Les uses his tracking skills and keen observation of the big picture to explain what caused some strange signs in the woods that some might consider “mysterious.”

es starts his trek in the Caucus Mountains by organizing. He’s found something vital for any survival situation - a source of water. He rearranges hit survival kit to take as much as he can.

Les faces a fire ant infestation.