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

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Mesoamerican monoliths and zoomorphic stones covered in royal visages, ancient mythology, and grand celestial events.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

Local legend says the remains of Father Christmas lie within the medieval grounds.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

One of the last surviving ancient Buddhist sites in the region, it escaped the brunt of several Hun invasions thanks to its remote location.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

The other side is actually green.

Rocky Atlantic beach home to a stunning stone arch.

Vast stretch of tide-pools with a unique Moroccan charm.

The oldest known university in the world is in Fez, Morocco.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

A fortified city, home to a remaining population of five families

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

Mosaics, storks, and brothels—this ancient city has it all.

One of the most spectacular canyons in the world.

Morocco's Argania trees are infested with nut-hungry goats.

Founded as a refugee camp, now a popular tourist spot.