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

This doorless 20th-century elevator doesn't stop or slow down.

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

Two monstrous faces loom over a village in Czechia.

This artificial cave looks like something out of a fairytale.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

A mocking tribute to the past and modern leadership of Prague.

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

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Walk through Czech history in Prague's largest graveyard.

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

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.

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

Sofia's legislative center is continuously reinventing itself.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

UNESCO-protected ancient burial ground.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.