A remarkably well preserved tower dating all the way back to the Iron Age.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

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

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

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

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

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

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

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

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

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

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A 30-acre garden inspired by the principles of modern physics.

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.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

These fantastically named natural pools look like something out of a Scottish myth.

Famously misunderstood wonder of the ancient world