The first photos on this post actually came before the 4th post on our way from Lake Titicaca to Cusco and through the Sacred Valley to Machu Picchu, but the Ancient Lost City of Machu Picchu just had to have its own post. So do make sure to see the 4th post after looking at this one, as Machu Picchu really is something very special.
The Sacred Valley and Cusco are marvelous. Cusco was the capital of the Incan Empire and the Sacred Valley, at a lower elevation, was their agricultural area with special regions for nobility. The soaring Andes mountains, with snow and glaciers, cap off spectacular scenery. Cusco is a wonderful city for walking around and just exploring the Incan/Spanish architecture and little side streets.
The Main Square is one of the prettiest anywhere.