Eighty million natural history specimens call this gargantuan museum home.

Christ's blood preserved in a Belgian town.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A brush maker used his factory to protect blind Jews from the Gestapo.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

Whether they are bulls or pigs, these ancient animal sculptures are fascinating relics.

A huge cathedral single-handedly constructed by one eccentric monk.

Geological storytelling.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.