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.

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

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

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

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

Famously misunderstood wonder of the ancient world

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

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