A cheeky architectural easter egg.

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

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

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

Enormous sandstone towers loom within a Czech forest.

A crucified and bearded female saint.

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

This former quarry is now a picturesque gorge that hides a sunken lake.

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

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

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

Two monstrous faces loom over a village in Czechia.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

A former squatter's paradise outside Prague.

The oldest garden in Prague, once part of an medieval orchard.

Dedicated to the unsung history of human waste.

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

A surreal statue honoring Prague's favorite literary son.

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

Monument to a suicide protesting the Soviet invasion.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

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