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

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

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

A cluttered and astounding collection of antiquities and curiosities.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Curious cave that stays a cool 56 degrees all year long.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

What is the Thing?

See massive fossils that are over 200 million years old in northeastern Arizona.

The only nuclear weapon assembly and disassembly plant in the U.S.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Golden Gate Park's historic collection of plants.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

An oil baron's wild paradise and the winner of an ill-fated air race.

A museum honoring Oklahoma military service, where you can look into Hitler's mirror and see a Mickey Mouse gas mask.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

The largest land animal skull ever discovered.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

A modernist landscape of water and sci-fi concrete.

Community bookshelf of 25-foot-tall book spines.

Europe's largest prehistoric mound – burial site of a legendary king?

The oldest working mechanical clock in the world.

A petite castle folly in the English countryside.