Hiking the 4 day Inca Trail to Machu Picchu is one of the best hikes in the world for its exquisite natural beauty and different ecological niches ranging from high deserts to tropical forests. During their epoch, the Incas created a vast network of roads that go throughout the Andes from Argentina to Colombia and from the coast to the Amazon rainforest. The 4 day Inca Trail to Machu Picchu is the most important section of that trail system, which takes you from the Andes to the Amazon.