This 1967 experiment in modular architecture was designed to be a new model for urban living.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

Banksy's image of a naked man dangling from the window of a sex health clinic.

This London plaque marks the spot where David Bowie's famous alien made his debut.

The monster at the center of the Darwin Center Spirit Collection.

Giant, friendly pelicans in Central London, the most unlikely of places.

Rebuilt remains of a temple to Roman god Mithras.

One part local history, 99 parts gruesome haunted house.

A tongue-in-cheek arcade where the games are based on everyday life.

Banksy gives themself artistic license with this piece of London street art.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

The abandoned coal loading dock is a canvas for unsanctioned art.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

America's first serial killer rests in anonymity.