At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

This World War I fortress is the perfect place to catch a Montenegrin sunset.

The history and future of cannabis.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Museum preserving torture methods from the past.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A surreal statue honoring Prague's favorite literary son.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The hidden lair of an alchemist rediscovered in a 2002 flood.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

On a small island, a replica of a Finnish village from the Iron Age.

Finnish lake, and scene of an infamous murder mystery.

A 246-foot-high revolving restaurant rises unexpectedly from a forested Finnish hilltop.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

A little-known sculpture park of contemporary environmental art in a Lapland forest.

Hidden deep in a forest is this geological wonder carved by glaciers.