One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A 30-acre garden inspired by the principles of modern physics.

This South London cemetery holds the remains of more than 15,000 people.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

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

Banksy gives themself artistic license with this piece of London street art.

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

Eighty million natural history specimens call this gargantuan museum home.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

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

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

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

These fantastically named natural pools look like something out of a Scottish myth.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

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

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

Infamous and now demolished panopticon prison built by its former inhabitants.

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.