Editor's Note:
Built in the 15th century, the Inca citadel of Machu Picchu in Cusco, Peru, has been recognized by UNESCO as a World Heritage site since 1983 for being “an absolute masterpiece of architecture and a unique testimony to the Inca civilization." It stands at an altitude of 2,430 meters and is regarded as a must-see destination in Peru.
The Inca citadel of Machu Picchu seen on August 26, 2008. The site was uncovered by American historian Hiram Bingham in 1911. Photo: CFP 
The Inca citadel of Machu Picchu seen on August 26, 2008. The site was uncovered by American historian Hiram Bingham in 1911. Photo: CFP 
Pictured is the Inca citadel of Machu Picchu, captured on October 22, 2007. Photo: CFP 
Pictured is the Inca citadel of Machu Picchu, captured on October 22, 2007. Photo: CFP 
Pictured is the Inca citadel of Machu Picchu, captured on October 22, 2007. Photo: CFP
