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

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

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

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

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

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

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

This single-track road rewards brave drivers with stunning Scottish scenery.

This two-legged horse statue celebrates a beloved cartoonist and his quirky characters.

These engineering masterpieces are a dominant feature of the Belfast skyline.

Stockholm's deepest subway station is also a stunning ecological wonder.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

This amazing 15th-century mural remained hidden in plain sight for centuries.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Belfast's namesake river still winds below the city center, hidden from sight.

Scotland's only funicular railway is also the United Kingdom's highest.

In 1396, two Scottish clans that had been violently feuding for centuries finally faced off in a bloody battle in this park.

The castle still holds traces of the abandoned Roman fort it was built atop.

For over 500 years this timbered alms house has provided a home for elderly residents of Coventry.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.