An Anglo-Saxon cross inscribed with possibly the oldest written work of English literature.

This abandoned oil depot produces world's longest echo in a manmade structure.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

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

A whale's jawbone and a malfunctioning harpoon welcome you to the village of Bragar and its lore.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

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

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

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.

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

A pub that is literally in the middle of nowhere, but continues to do business.

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

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

The fountain marks the area where hundreds of accused witches were burned at the stake.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This series of Scottish caves has no clear purpose other than baffling historians.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

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

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.