Machu Picchu is located in Peru, and to get there you will have to travers rainforests and mountains alike to find the ancient Inca city located amongst the clouds, situated between the two mountains, Machu Picchu, and Huayna Picchu. It is the most visited site in Peru, one of the most visited in South America, and is a Unesco World Heritage Site.
Machu Picchu was built by the Inca for reasons still not fully understood today, but what we do know by the geography of the location is that it is strategically located to defend against defenders, and is organised well to fight off any attacking force. We also know that the city was abandoned when the Spanish Conquistadores invaded what is now Peru but what was the Inca Empire. The site remained undiscovered by modern western society and academia until 1911 (although locals new of its existence).
Machu Picchu has been undergoing a revitalisation since its discovery, with many of the surrounding buildings having been rebuilt in order to give the location a more complete experience for the tourists visiting the place.