This four-day walking tour will take you on amazing    1     through the Andes Mountains on the way to the city of Machu Picchu. After reaching your     2    , you will have a day to     3     and be amazed by this ancient city. Especially amazing is the Incas’ dry stone method of building. Inca builders cut stones to     4       sizes so that nothing was needed to hold walls together other than the perfect    5     of the stones.