Space-age monument to an early 20th-century uprising.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Structure built from the skulls of vanquished foes.

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.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

An ethereal glowing blue ocean cave in Croatia.

A Serbian church lit by chandeliers made of weapons.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A futuristic, brutalist masterpiece that is also strangely prison-like.

Two distorted Romanesque columns hold aloft a mine cart in honor of laborers who died during WWII.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

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.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

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

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

This historic cemetery was inaccessible for several years due to dozens of land mines.