Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

This skewed English house has looked like it's going to fall over for centuries.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

This giant wooden treehouse within a sprawling garden has its own eatery.

Home to the most complete dodo remains known - one head, and one foot.

A petite castle folly in the English countryside.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

The oldest residential street in Europe also features an optical illusion.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

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

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Human-made caves excavated to hide a secret society of wealthy pagans.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Cliffs full of fossils at the portal to England's Jurassic Coast.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

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.

This romantic, decaying 13th-century ruin on the edge of Sherwood Forest is reputedly one of England's most haunted places.