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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This famous archeological mystery may be an ancient example of movable type.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

The former Naval shipyard is open for exploring - mostly.

A monument to the conquistador became increasingly controversial in the very city that he founded.

The 19th-century vessel floats proudly on Lake Titicaca, but its journey from Britain to the Peruvian altiplano was far from smooth sailing.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

A pretty park of over 1,600 olive trees that grew from just three saplings brought over from Spain.

The large collection of pre-Columbian pottery might make you blush.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

This stone complex marks the urban center of a lost civilization.

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

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Death rituals and sacrifice inside a Peruvian megalith.

The Uros people live on floating reed islands in lake Titicaca.

Huge stone depressions which may have acted as an Incan agricultural experiment.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

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

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.