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

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

One part local history, 99 parts gruesome haunted house.

360° views of the city plus five floors of optical illusions and hands-on science.

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

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

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."

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.

The fountain marks the area where hundreds of accused witches were burned at the stake.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This 1920s Dutch barge is now a floating bookstore.

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

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

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.