This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

This once-derelict building is now one of the most beautiful bookstores in the world.

Something's watching you.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This snug medieval lane is one of the narrowest streets in the world.

See how paper is made the old-fashioned way.

Decorated with a staggering 1,380 ladybugs, the installation has turned what was once a grim, forgotten nickel mine into a landmark and a statement.

Oriental bazaar in the heart of Sarajevo.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

The first mosque in the world to receive electricity.

The place where World War I began.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

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

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

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

Gargoyle head that brings good luck.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

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