A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

The much-beloved mascot of a local museum.

Every New Year's Day, locals don gaudy costumes and dive into the frigid Firth of Forth.

This king penguin is a knighted brigadier of the Norwegian Army.

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

Inside this cathedral is a shoulder bone belonging to the Patron Saint of Scotland.

A bronze statue of a low three-legged seat commemorates a piece of furniture that started a riot.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

Neon artworks light up this dark Edinburgh tunnel.

Europe's official "zero-level," the equator of elevation.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

This cheese shop also houses a museum devoted to Dutch dairy.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

Once the home of a hermetic monk, this cave now houses a small church.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

"Purveyors of traditional sweets and vintage treats."

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The Great Fire of London and the regulation of one-way streets both started in this alley.