A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Once the home of a hermetic monk, this cave now houses a small church.

A 26-foot shark sculpture—a statement about bombs—set off a municipal battle royale.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

A mysterious bridge over a sunken Roman road.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

This historic abandoned train station looks like a stop for ghost trains.

The Bristol Camera Obscura housed in an ancient windmill.

The secret wartime bunker built on the platforms of an abandoned Tube station.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

These haunting ruins belong to an ancient village that once had one hell of a view.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

This enchanting hill is home to fairy lore and a sinister local mystery.

Built to hold the worst of the worst of the Nazi war prisoners.

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

19th century tunnels burrowed under Liverpool.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

A 550-square-meter micro-nation off the coast of Britain.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.