Ruins of a German Castle on top of a towering stone pillar.

A battle between nature and architecture in the Cambodian jungle.

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

The Uros people live on floating reed islands in lake Titicaca.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

Mystic Incan rock piles three miles above sea level.

Death rituals and sacrifice inside a Peruvian megalith.

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

Huge stone depressions which may have acted as an Incan agricultural experiment.

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

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.

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

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The last bastion of Roman presence north of the Alps looms over a German town.

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

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Longest fortress system anywhere in Europe.

Bridge that died in war and was resurected.