The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Something's watching you.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The first mosque in the world to receive electricity.

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

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

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

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

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

The place where World War I began.

Oriental bazaar in the heart of Sarajevo.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

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

A pair of connected skyscrapers form this symbolic gateway.

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

A whimsical bridge adorned with decorative dragons.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

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