The celebrated Inca Trail of Peru is a 30-mile walk along the most famous portion of the extensive network of roads created during the Inca Empire.  Most of the walk is at high elevation in the impossibly steep Andes Mountains, reaching 14,000 feet.  Camping is required, but porters carry much of the load.  The finale is Machu Picchu, a World Heritage Site, which surpasses everyone’s expectations.