(Early!) Saturday morning we headed to Teotihuacan to visit and climb first the Pyramid of the Sun, and then the Pyramid of the Moon.&nbsp; The Aztecs began construction on these pyramids and nearby temples in 100 C.E. Beating the crowds, we had the top of the first pyramid all to ourselves, surrounded by hot air balloons that launch early in the day.&nbsp; It was absolutely a bucket list kind of morning.&nbsp;