Gargoyle head that brings good luck.

An ethereal glowing blue ocean cave in Croatia.

This one-time health resort was used by aristocrats around the world.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

The world's most important buildings shrunk to a tiny size.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

It's good luck to be mocked by this monkey.

A preserved college lock-up that recalls a clubhouse approach to discipline.

A small but immensely extravagant palace built by the "Night King."

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

A wunderkammer of exoticism immortalized by Tom Waits.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

A Nazi concentration camp and Anne Frank's place of death.

A concrete plant shaped like four giant soldiers commemorates one of the most decisive battles of the Napoleonic Wars.

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

Mummified monks and the accidentally interred, in a 17th-century crypt.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

Europe's second largest ossuary wasn't discovered until 2001.

A cheeky architectural easter egg.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.