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.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Giant topiary dog once played a role in a terrorist bomb plot.