Legends surrounding this megalithic tomb range from giants to a dwarf named Trollid.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

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

One of Scotland's earliest hydroelectric power stations.

A small, former industrial site overlooking Loch Kinardochy.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

This mountain is one of the largest in Scotland but is better known for its hollow insides.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

Every September, international competitors flock to the flooded quarries of a tiny Scottish island.

A bay of elaborate, historic toilets are held in high esteem at this Scottish dock.

A plaque installed underwater marks the fall of a royal family from an imagined parallel universe—part of a globe-spanning art project.

Built during the Scottish boom in the oil industry, the village was never inhabited.

A bizarre stone beast lurks on the beach of a popular tourist island.

The United Kingdom's smallest working cathedral also serves as a quaint bed and breakfast.

This stately estate house features a tower covered in a bright, modern mural.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

A small waterfall tucked away in the forest of Harmby Gill.

The only surviving leech house in the United Kingdom was a home for bloodsucking worms until the 1900s.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

These remarkable cascades are the jewels of Upper Tees.