This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

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

An underground city of salt.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This Gothic church was wheeled in its entirety to a new location a half a mile away.

A Cold War secret surveillance tower used to spy on radio communications.

This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

An army of sleeping knights sculpted by a self-taught local artist beautifully depict an old Czech legend.

Every part of this unusual home is built into the sandstone rock.

Massive installation of Europe's negative stereotypes.

The 14th-century ruins are said to contain healing powers.

These 17th-century mummies are no longer naturally preserved, but remain on display today.

Enormous sandstone towers loom within a Czech forest.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

This artificial cave looks like something out of a fairytale.

Two monstrous faces loom over a village in Czechia.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The first museum in the world devoted to sexual gadgetry.