If you would interested in Wikipedia what Machu Picchu is you will read that Machu Picchu (Quechua: Machu Pikchu, “Old Peak”, pronounced [ˈmɑtʃu ˈpiktʃu]) is a pre-Columbian Inca site located 2,430 metres (8,000 ft) above sea level.[1] It is situated on a mountain ridge above the Urubamba Valley in Peru, which is 80 kilometres (50 mi) northwest of Cuzco and through which the Urubamba River flows. Often referred to as “The Lost City of the Incas”, Machu Picchu is one of the most familiar symbols of the Inca Empire.

No doubt this is the palce that must be visited. If you want to get complite information to visit the Citadel of Machu Picchu there are many agencies proposing a reliable, fast and secure system to reserve your excursion on-line, offering all year round without spaces limitation, and consists on a round trip by train from Cusco and the guided visit of the famous Citadel. Here is recommendation for all those who have it as their life-aim to trek to Machu Picchu and who should be aware of some ground-rules before organizing their trip – http://www.tripadvisor.com/Travel-g294318-s409/Machu-Picchu:Peru:First.Time.Visitors.html