Secret refuge and museum of the Duke of Florence.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Unconventional site where the tracks of Zurich tramcars intersect.

The prototype for all Nazi concentration camps.

The footprint of a frustrated devil in Munich's Cathedral.

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

The fairy tale castle of the "fairy-tale king."

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Secret hideaway for an alternative beach experience.

When flour explodes, it's not a pretty sight.

The only arched bridge made of stone on the entire Mississippi River.

20,000 pieces in a Frank Gehry-designed building.

These curious caverns have been home to mushrooms, gangsters, and disco.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The "lovely red Vega" of the legendary record-settling pilot.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The final resting place to 300 Victorian-era pets hides inside the city park.

Hear the quietest sound from across the dome.