A fantastic castle rumored to be the birthplace of King Arthur.

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

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

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

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

Northern Ireland's Brobdingnagian stepping stones.

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

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

Famously misunderstood wonder of the ancient world

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The world's largest collection of witchcraft regalia.

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

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

A dangling church built over a Colombian gorge.