Catacombs turned marketplace.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The world's largest collection of witchcraft regalia.

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

The sign at the garden gate reads: "These Plants Can Kill."

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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.

A labyrinthine underworld of tunnels and caverns hides beneath the city.