This was the best shot I took in all of Peru.  We were incredibly lucky to be in the right place when the clouds decided to assume this amazing formation; ten seconds later, it was fogged over again.  Here is a bigger version of this photo.  If you look very closely you can make out some of the buildings at to top of Waynu Picchu in the background.  After an exhausting day of exploring the ruins, we returned to the train station and headed back into the Sacred Valley.