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

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

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

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

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

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

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

This Scottish burial tomb once held hundreds of ancient eagle bones.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

The most northern place on the mainland of Great Britain.

A collection of short standing stones covers this hillside.

A Neolithic burial tomb connected with a colorful array of legends.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Eerily lifelike effigies stare at everyone who enters this sanctuary.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

This 19th-century island fort built to protect against an invasion by sea.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

This tranquil churchyard in the heart of England’s mining country whispers tales of both triumph and tragedy.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

This charming railway is one of the oldest and steepest funiculars in England.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

A 13th-century fortified manor house that was once sieged during the English Civil War.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

This Iron Age hill fort remained hidden until a series of storms revealed its history.