The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

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

Where the sleeping monsters of Scotland's oil industry are left to rust.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

The world's tallest boat lift stands as a massive piece of industrial tourism.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Follow the original medieval paths that wind through this intriguing section of the city.

His "Lionheart" is entombed separately from the rest of his body.

If they push on just the right spot, even the weakest person can move this titanic boulder.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

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

An unusual round church in London with a Templar past.