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

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

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

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

Enter the world under the hill at this ancient UK burial chamber.

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

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

A remarkably well preserved tower dating all the way back to the Iron Age.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

Geodesic dome luxury retreat in the Scottish Highlands.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A close look reveals that the Scottish monument is just slightly off-kilter.

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

This remote Scottish isle is only inhabited by seals, birds, and the memory of a tragic settlement.