A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

Structure built from the skulls of vanquished foes.

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

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

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

Longest fortress system anywhere in Europe.

Gargoyle head that brings good luck.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Humble beginnings for one of the world's most famous scientists.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

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

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

Controversial site of what could be Europe's first pyramid.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

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

Oriental bazaar in the heart of Sarajevo.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.