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

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

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

A surreal statue honoring Prague's favorite literary son.

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

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

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

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

This renaissance château was home to an infamous witch hunter who sent a hundred suspected witches to their deaths.

An enormous and lavish Gothic church in Czechia.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

The last bastion of Roman presence north of the Alps looms over a German town.

A former ironworks that was the first UNESCO industrial site.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

The only gulag ever to exist in socialist Yugoslavia.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This antique thermometer honors the creator of the first universal temperature scale.