City in the Sky: Machu Picchu，The Miracle of the Inca Empire 

Before Columbus arrived in the Americas, Peru was the core of the Inca Empire. The Inca civilization left many amazing ruins on this land, the most famous of which is the ancient city of Machu Picchu. Machu Picchu was listed as a World Cultural Heritage by UNESCO in 1983. In 2007, it was selected as one of the New Seven Wonders of the World and is known as the City in the Sky.