The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A forgotten "city of water" underneath the famous Trevi district.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

An Aztec snake god has taken the material form of an apartment complex.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

This gorgeous, colorful 18th-century church is part of one of Bolivia's few surviving Jesuit missions.

Thousands of fossilized footprints speckle this Bolivian national park.

The celebrity luchadores of La Paz are tough ladies in traditional petticoats and braids.

In La Paz's huge, city-sized cemetery, the deceased are stored in rows of apartment-like buildings.

Death road of Bolivia.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

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

This unimaginably large pile of sand near Nazca is one of the tallest dunes in the world.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

The world's largest clay lick, where parrots gather to snack.

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

An unexpected desert oasis in South America.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

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

These roaring primates were considered a divine creature in the cosmology of the Maya.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.