This tunnel entrance is built to resemble a grand castle but no one is quite sure why.

The remnants of a strange stilted building on rails can still be seen at low tide.

England's most notorious suicide spot.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

WWII artifacts, including the building itself.

A museum and gardens with unusual plants and a history of progressive programming for the blind.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This modest marker near Notre Dame identifies the very center of Paris.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

The remains of Crystal Palace Great Exhibition of 1851.

Abstract dinosaur models in London.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

An artistic tribute to the famous singer, just around the corner from where he was born.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Ship-sized kinetic sculptural fantasy.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

France's most famous cemetery, with some of its most curious tombs.