This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This automated sculpture of two men peeing will spell out text messages with their micturition.

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

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

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

Macabre astrological automaton clock dating to the late 1400s.

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

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

The first museum in the world devoted to sexual gadgetry.

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

Two monstrous faces loom over a village in Czechia.

This spooky statue sits outside a famous Prague theater.

Enormous sandstone towers loom within a Czech forest.

This smily stone feline is meant to represent a mythical lion that almost destroyed the island of Kea.

A spectacular cave and a beguiling lake.

One of the most photographed locations in the entire city.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Where commuters walk through remnants of an ancient Greek necropolis.

A sacred lake with thousands of sacred carp and a biblical history.

The ancient abodes are a testament to human ingenuity amid harsh climates.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

Roman ruins top white travertine terraces formed by ancient hot springs.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

In this historic region, homes and churches are carved into ancient volcanic rock formations.