Long abandoned underground complex to keep royals safe from a nuclear war that never came.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

The highest lighthouse in Scotland shines from an abandoned island.

The ruins of the second of three churches dedicated to the saint in a touristic Scottish town.

The abandoned transportation hub hides within the Glasgow attraction it once served.

This abandoned hospital village was once viewed as an innovative way to deal with mental illness.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Wonderfully preserved Victorian factory, complete with a preserved steam powered engine house.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

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

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This Scottish bay still reveals evidence of its days as a seaside swimming pool.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.