One of the oldest and certainly best preserved Cistercian abbeys still in existence.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This massive subterranean fissure is known as the "underground Grand Canyon."

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

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

A whimsical bridge adorned with decorative dragons.

The world's most important buildings shrunk to a tiny size.

Europe's second largest ossuary wasn't discovered until 2001.