Lost to the jungle for centuries, Machu Picchu was rediscovered by Hiram Bingham 100 years ago. It's now probably the most famous sight in South America - and justifiably so. Perched high above the river on a knife-edge ridge, the ruins are truly spectacular. The best way to reach them is on foot, following parts of the original paved Inca Trail over passes of 4200m (13,500ft). This all-in-one guide includes hiking options from two days to...