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

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Hear the quietest sound from across the dome.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

An unusual round church in London with a Templar past.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

Eighty million natural history specimens call this gargantuan museum home.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

A favorite with sightseers and locals alike, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Reminders of the Battle of Berlin still scar the railway.

A slice of central Asia in the middle of Berlin.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Architectural monsters are devouring this palace's every door and window.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.