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

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

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

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The first museum in the world devoted to sexual gadgetry.

A surreal statue honoring Prague's favorite literary son.

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

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

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

1513 Turkish world map, full of European state secrets and snarky commentary.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A 1600-year-old church carved into the rock, with painted frescoes from 900.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.