A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

Legend says this cave housed a 16th-century cannibal and his family of 48.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

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

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

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

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

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

Fantastically decorated underground chambers built in the 1760s.

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

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

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

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

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.

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

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

This crumbling folly looks like an enchanted left over from Middle Earth.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.