Due to the high altitude, when we first flew into Cusco, we left immediately for the Sacred Valley and Machu Picchu and we were excited to explore it on our way back. Cuzco is a magnificent city which dwarfs anything around it and is filled with great architecture, history and food. Being so high above sea level means having to watch your physical activity, but since we had already acclimated in the Sacred Valley for a week we felt pretty good to go.