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The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

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

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

A clock designed to run with perfect accuracy for 10,000 years.

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

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

A subterranean playground in an abandoned slate mine.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

A cluttered and astounding collection of antiquities and curiosities.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

This 1920s Dutch barge is now a floating bookstore.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

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

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

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

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

Northern Ireland's Brobdingnagian stepping stones.