These fantastically named natural pools look like something out of a Scottish myth.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

The early American colonists were such ferocious drinkers the law actually required every town to have a tavern.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

An enigmatic natural rock formation with a manmade passage cut through the center.

A well-preserved 2nd century fort where moles are the archaeologists.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This snug medieval lane is one of the narrowest streets in the world.

This massive underground salt mine now holds a sci-fi theme park in its depths.

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.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

Death rituals and sacrifice inside a Peruvian megalith.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

An abandoned Incan construction project left behind a mysterious "doorway."

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

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