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

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A desert that evokes the surreal.

This red lake 4,000 meters above sea level is home to rare flamingos.

A black and white solution to the Bolivian city's traffic problems.

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.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

The world's most important buildings shrunk to a tiny size.

The medieval "dragon" on an Austrian city's coat-of-arms comes to life in a fountain.

The juke joint where legendary soul artists ate, drank, and made merry.

Gargantuan home of Russian science.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

A remote forest of stone pillars along the Lena river.

A seemingly endless landscape of pure salt stretches far across Bolivia.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The first declared National Monument in the United States.

Macabre astrological automaton clock dating to the late 1400s.

Famously misunderstood wonder of the ancient world