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

The sophisticated hydraulic system of the Nazca civilization.

These overlooked ruins give an intimate look at the Inca Empire's urban planning prowess.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

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

An unexpected desert oasis in South America.

This bullring in Lima is the oldest in the Americas and the second-oldest in the world.

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

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

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

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

The little bear in the "funny kind of hat" has made his way from London back to Peru.

Geometry and mystery come together in an epic show of octagonal masonry.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Southern Italy's spinning top village.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A Spanish town built into the cliffs.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

Single runway interrupted by a busy road that cuts across its middle.

A 16th-century Andalusian palace.

Spain's largest bullring offers a unique glimpse at architecture and history.

This small Spanish village still pays homage to the Spaghetti Western films that were shot there in the 1960s.