1513 Turkish world map, full of European state secrets and snarky commentary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This famous city eluded concrete detection until the early 2000's.

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Medieval torture techniques with a modern conscience.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Costa Rican topiary park is a surreal garden of unearthly delights.

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

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Home to the deepest rift anywhere on Earth.