A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

A historic hill of tall tales, with one rather special tree.

Seat of the Duke and Duchess of Devonshire for centuries.

Macbeth's infamous "Great Birnam Wood."

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

The final resting place of soldiers' loyal canine companions.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Three bridges straddle a stream, one stacked upon the other.

The monster at the center of the Darwin Center Spirit Collection.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

This stately estate house features a tower covered in a bright, modern mural.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

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

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

A modern English garden of eccentric beasts, follies, and oddities.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

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