Take any trek along the Inca Trail and finish at Machu Picchu. You will get to walk right through the Sacred Valley, which is an ancient wonder of the world. The Classic 4-day hike is among the most popular because any reasonably fit person will have no trouble finishing the hike. Another, and a little easier, alternative is the Short Inca Trail. It’s only about two days long and starts further along the Vilcanota River Valley closer to Machu Picchu.