A mysterious artist-run cabinet of curiosities and library.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

A network of concealed passageways lies within a busy London Underground station.

The remains of Crystal Palace Great Exhibition of 1851.

This coffee shop lies hidden beneath a historic church.

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

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

The longest hedge maze in the world.

Hear the quietest sound from across the dome.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The final resting place to 300 Victorian-era pets hides inside the city park.

The anatomical-pathological collection of a man who changed surgery.

The curios of pharmacist and collector Henry Wellcome.

This series of Scottish caves has no clear purpose other than baffling historians.

Catacombs turned marketplace.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The world's largest collection of witchcraft regalia.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

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

A little slice of Japan and its aesthetics in London's Holland Park.

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

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.