This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

These ruins are a hidden gem, complete with fantastic views over the cliff edge.

The ruins of a medieval seminary some say is the oldest university site in Scotland.

An optical Illusion once believed to be an electrical phenomenon.

These ancient sea caves hold Britain's highest concentration of Pictish rock carvings.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

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

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

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.

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

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

A little-known hot spring haven right below the highway.

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

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

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

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

Surreal riveted sea forts once protected the Kent shores from German attack.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The anatomical-pathological collection of a man who changed surgery.

A fantastic castle rumored to be the birthplace of King Arthur.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.