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

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

This hotel is located on the edge of the world's largest salt flat and is made out of the only material around.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A valley of unique erosion patterns lends to a view like nothing on Earth.

Mountain of unimaginable riches that bankrolled the Spanish Empire, complete with its own underworld god.

Spanish religion mixed with local architecture has yielded a network of churches unlike any other.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

What was once a unique system of urban elevators is turning into a mechanical ruin.

A toxic lake near a volcanic caldera that is home to flamingos and other life.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A bright little alley in La Boca is a part of tango history.

Beautiful public park off the beaten path and away from tourists.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

This Brazilian palace island was once the site of the last grand ball before revolution.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

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.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The middle finger of modernity.

Secret refuge and museum of the Duke of Florence.