A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

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

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

Climb inside an iron crystal magnified 165 billion times its normal size.

Belgium’s famous peeing statue has worn many hats (and coats, and pants), which are on display at this small museum.

A little sculpture with a large wardrobe.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

Rock carving created 1,300 years ago 75 feet off the ground.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A diminutive statue that was inspired by the sculptor's own daughter.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This demon atop the Notre-Dame de Paris looks utterly bored.

It houses a menagerie of wondrous taxidermy specimens from around the world, including the remains of a famous gorilla.

A monument dedicated to the unrecognized Black "mother" of modern medicine.

One of Bristol's best-hidden gems has ties to Lord Byron, whence it became the nation's first reformatory school for girls.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

The world's oldest bookshop still in operation.

A market built atop boats is one of the few floating holiday markets in Europe.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.