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

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

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.

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

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

The most loyal of little dogs, or a Victorian era publicity stunt?

Possibly the oldest of Britain's ancient henges is also one of its most stark.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

The final resting place of soldiers' loyal canine companions.

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

Largest lake in Great Britain measured by surface area.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

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

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

These fantastically named natural pools look like something out of a Scottish myth.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

A retired military stronghold on the rolling green coast of Donegal.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.