We flew to Cusco this morning and headed out into the Sacred Valley. One of the stops we made was at the temple of Saqsaywaman. This was the first time I got a chance to look up close at Incan buildings. I was amazed at the way the stones were cut and fitted together. You couldn't slip a piece of paper into the joints. They also designed the walls with notches which prevented lateral shifting of the stones. And remember, these guys didn't have metal tools. Amazing!