The stately remains of Llywelyn the Great's mighty fortress.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

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

A breathtaking flower tunnel bursts with beautiful golden blossoms.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

This foolish Victorian sea fort was converted to a deluxe hotel.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

This haunting stone chasm is a hotbed of mossy rock and English legend.

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

The mystery of this small, brick pond eluded its possibly only investigator until his death.

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.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

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

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

A mysterious monument where a woman who records say never existed was burnt alive for being a witch.