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

This 13th century castle is chock full of ghosts and impossibly rare cows.

These upturned herring boats make nifty storage sheds for fishing goods.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

Britain's tallest megalith towers over the cemetery of a quiet English village.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Where America's first doomsday cult awaited the end of the world.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

A park full of outsider art, created by college students studying outsider art.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

The bizarre headgear looks like it was made for a fool, not a king.

These lush botanical gardens employ the most purrfect pest control force.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

The last street in Pittsburgh that's paved with wood.

An underwater statue of Christ blesses the depths off Key Largo.

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