The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Death rituals and sacrifice inside a Peruvian megalith.

An unexpected desert oasis in South America.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

Now containing the bones of the actual conquistador, instead of someone else.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

A seemingly simple canyon that was the backdrop to a number of famous movies.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

Monasteries on rock pillars, once accessible only by frayed ropes.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This massive subterranean fissure is known as the "underground Grand Canyon."

Bizarrely-painted church designed by a controversial artist.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The "dragon babies" of southeastern Europe.

This one-time health resort was used by aristocrats around the world.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.