Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This hidden green space is the city's second largest conservatory.

The largest greenhouse in the world is home to over one million types of plants.

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

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A unique waterfall that some believe attracts the fairfolk.

Surreal riveted sea forts once protected the Kent shores from German attack.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

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

Eighty million natural history specimens call this gargantuan museum home.

The longest hedge maze in the world.

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

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

The world's largest collection of witchcraft regalia.

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

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

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

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

A terrific purveyor of natural history objects and curios.

The macabre paintings created by famous suicide proponent Jack Kevorkian, or "Dr. Death."