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

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

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

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

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

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

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

The fountain marks the area where hundreds of accused witches were burned at the stake.

A 30-acre garden inspired by the principles of modern physics.

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

These fantastically named natural pools look like something out of a Scottish myth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A small square populated with giant birchwood sculptures.

These beautiful castle ruins are nestled in the Polish countryside.

This dazzling wooden church was constructed as part of an elaborate peace project after the Thirty Years' War.

A mysterious concrete hand reaches out from between the stones of Uniwersytecki bridge.

The center of this Polish border town was so thoroughly wiped out in World War II that only the foundations remain.

This mushroom-shaped rock has frustrated and fascinated locals for centuries.

Atop this library is one of the most beautiful green spaces in Warsaw.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

A striking public sculpture representing the period of martial law in Communist Poland.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.