Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

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

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

London's largest outsider art museum.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

This foolish Victorian sea fort was converted to a deluxe hotel.

Britain's only herd of free-ranging reindeer.

This Manchester laundromat is hiding something.

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

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

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

The oldest inn in England served brew to the crusaders.

England's most notorious suicide spot.

This modern labyrinth lies in the shadow of a ruined medieval castle.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A scattered trail of street art adds a pop of color to the city's stark structures.

Three bridges straddle a stream, one stacked upon the other.

This home on a quiet suburban street is completely covered with vibrant mosaics.

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

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

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

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