The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The largest caravanserai in Cyprus also includes amazing examples of Ottoman architecture.

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

The ruins of a fairytale castle with a tumultuous history stand high atop the mountains.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

This 135-year-old weather station studied the effects of the climate on human health.

An ancient knight and a symbol of the city's freedom.

Sofia's legislative center is continuously reinventing itself.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

A man throwing a giant severed hand towers over Antwerp’s main square.

The old fire station features a mural that has more to it than first meets the eye.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.