Oriental bazaar in the heart of Sarajevo.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

Bridge that died in war and was resurected.

Carefully reconstructed after the Bosnian War, this 16th-century bridge stands as a symbol of the country's enduring multicultural heritage.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

A 11-foot former president stands on a Kosovo street that also bears his name.

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

A striking symbol of the Bulgarian capital.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

At this 16th-century monastery in rural Bulgaria, visitors can also spend the night.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The now-serene site of the largest earthquake ever recorded in North America.

Considered by many to be one of the most dangerous highways in Alaska.

One of the best examples of the modernist movement in Madrid.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.