The world's newest astronomical clock is also its most accurate.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The elegant manor house where Kaiser Wilhelm II lived in exile after World War I.

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

Old Danish castle immortalized in Shakespeare's Hamlet.

Copenhagen's celebrated theme park and gardens.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

A mansion where wonders of Christmas are celebrated all year long.

Plans for this local observation tower were debated for so long, the allocated funds lost value and the design had to be changed.

The eroded core of an ancient volcano is now accessible by a short hike.

This no man's land slicing through the island is strewn with abandoned relics of another time.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

This spooky statue sits outside a famous Prague theater.

This subterranean studio is filled with fascinating kinetic art.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

The Netherlands' first car tunnel has an unusually rectangular shape.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.