Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

Flamboyant architecture from the turn of 20th century.

Oriental bazaar in the heart of Sarajevo.

Bridge that died in war and was resurected.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Pilgrimage site for star-crossed lovers.

Five candy-colored villages on the Italian Riviera.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

Breathtaking and huge 430 year old maps of Italy.

A whimsical bridge adorned with decorative dragons.

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

A musical instrument played by the sea.

An underground city of salt.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Highly spherical boulders on the shores of New Zealand.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This whimsically named Vietnamese stream is closer to a walkway than a waterway.

World's largest cave was only discovered in 1991, and now offers tours to the public.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.