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

Rebuilt remains of a temple to Roman god Mithras.

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

Eighty million natural history specimens call this gargantuan museum home.

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

The world's largest collection of witchcraft regalia.

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

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

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.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

The remains of the wrecked steam trawler can be found on the beach at low tide.

A prison tower–like edifice honoring a beloved local benefactor.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

The growing stones of Romania.

A Romanian church built from one single oak.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A stunning 18th century pharmacy and medieval chemist's collection.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

A collection of items from a way of life that no longer exists.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

The Natural History Museum that time forgot.