This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

This artistic temple brings together multiple architecture styles, but is only an example of one.

The home of a neoclassical master is now a shrine to his chosen art style.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

This Italian foot path winds through the mountains via 52 individual tunnels.