A magnificent, iconic stone tower in the Scottish Highlands.

The oldest residential street in Europe also features an optical illusion.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

Glasgow’s piece of the patron saint of love.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

The strange behavior of a tween led to allegations of witchcraft and a curse being placed on anybody within earshot.

The stately remains of Llywelyn the Great's mighty fortress.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

This 1920s Dutch barge is now a floating bookstore.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

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

An incarceration museum on the spot of possibly the oldest prison in England.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.