A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

Rock-cut caves and 7,000 Buddhist sculptures carved into the nearly sheer face of a sandstone mountain.

London's smallest police station is barely the size of a phone booth.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

A Nesting Doll of Churches.

Architectureal fantasy quarter of Rome.

Ruins of a German Castle on top of a towering stone pillar.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

This remote castle was built to be a wealthy businessman's palace of vice but is now simply a historic vacation cottage.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

A unique waterfall that some believe attracts the fairfolk.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

A ruined castle has more than its fair share of legends and ghost stories.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

One could not be blamed for literally walking all over this supposed landmark.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

A church filled with the bones of hundreds of virgins martyrs—or so they say.