The ruins of Macchu Picchu are located on the peaks of the Andes, about 800m above sea level, in the valley of the Urubamba river. The mythical citadel was built in the 15th century by the Incas, surrounded by steep rocky slopes. Abandoned soon after the arrival of the Spanish, in 1532, the city then remained hidden in the clouds until 1911, when Hiram Bingham rediscovered its ruins. The ancient and lost Inca civilization was highly evolved in the arts and in the construction of stone buildings and roads. The city of Macchu Picchu remains one of his most surprising achievements.