A complete network of interconnecting roads linked Cusco to its provinces and other kingdoms and the Inca Trail to Machu Picchu was part of that system. Today it has become the most famous and popular trek in South America due to the variety of attractions it offers. The trail route lies within the Machu Picchu Historical Sanctuary, which was created by the government in 1981 to protect the natural beauty and the archaeological sites of this extraordinary area. This spectacular trail runs from high mountains down to cloud forest, passing through a number of diverse ecological zones filled with an enormous variety of plants and bird life. The route is ... studded with archaeological sites which lead the visitor to the lost city of the Incas; Machu Picchu.