This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An underwater statue of Christ blesses the depths off Key Largo.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

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

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

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

The Greek island's old British cemetery feels like a forgotten garden.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

The earliest known map to show America, discovered by accident at a Paris bookshop.