These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

An outlandish shoe shaped house built by an eccentric millionaire.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

No need to strap in for a “ride” on this walkable roller coaster.

This futuristic German television spire is actually the world's largest digital clock.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The telescope that discovered Neptune.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tremendous timepiece was once the largest cuckoo clock in the world.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.