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

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

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

A series of playful yellow penguins share a serious message about the environment.

Enormous sandstone towers loom within a Czech forest.

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

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

A spiral staircase twists to the top of this unusual Czech lookout tower.

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

Europe's largest natural bridge has a 19th century royal chateau built into its side.

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

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

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

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

The first museum in the world devoted to sexual gadgetry.

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

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

Giant wind turbine with observation deck at the very top.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.