The lost city of the Incas
Machu Picchu, the 15th-century Inca citadel on a ridge above the Urubamba river, lives up to every photo. Reach it by train to Aguas Calientes and a bus up the mountain, or on foot along the multi-day Inca Trail. Entry is by timed ticket on set routes and numbers are capped, so book well ahead, especially for the trail and for Huayna Picchu.