A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

A massive playground in the woods of Germany.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

Picturesque basketball courts sheltered by historical defensive walls and with an enviable sea view.

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.

Oriental bazaar in the heart of Sarajevo.

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

A historic and beautiful Art Nouveau chamber in a historic railway station.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

One of the best examples of a Byzantine period monument in Albania.

A whimsical bridge adorned with decorative dragons.

The final resting place for the remains of 143 Habsburg royalty.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A famous big wave from Japan serves as a tribute to the victims of the disastrous Elbe flood.

The bridge that cost Germany a World Heritage Site.