This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This massive subterranean fissure is known as the "underground Grand Canyon."

This one-time health resort was used by aristocrats around the world.

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 place where World War I began.

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

Bridge that died in war and was resurected.

Where the lovelorn find a home for their sentimental keepsakes.

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

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

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

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

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

The former Naval shipyard is open for exploring - mostly.

The only visible piece of San Francisco's most famous shipwreck.

Appropriation-friendly collection of books, periodicals, and more.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.