A fantastic castle rumored to be the birthplace of King Arthur.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Catacombs turned marketplace.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A hands-off space for graffiti artists to hone and display their skills.

A student driver's nightmare.

Northern Ireland's Brobdingnagian stepping stones.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Famously misunderstood wonder of the ancient world

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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