Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The oldest working Brewery in Britain.

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

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

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

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

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

The cedar tree in Highgate Cemetery earned its title by accident.

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

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

A memorial to a dog that inspired rioting in the streets of London.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

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

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

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

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.