As giant piles of rocks go, the Mayans did a phenomenal job building El Castillo at Chichen Itza, in Yucatan Mexico. The pyramid, built sometime between the 9th and 12th centuries, has 91 steps on each side, adding to a total of 364. An additional single step at the top brought the temple in align with the modern yearly calendar of 365, one trip, more or less, around the giant ball of fire in the sky. Was this design intentional? Click to Read More...