This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Follow the original medieval paths that wind through this intriguing section of the city.

Pop culture has helped to keep this iconic British building from being destroyed.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

The heads of two giant mythological water horses honor Scotland's horselord past.

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.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

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

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This hidden green space is the city's second largest conservatory.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Northern Ireland's Brobdingnagian stepping stones.

The curios of pharmacist and collector Henry Wellcome.

The atmospheric road was never meant to be so creepy.