Chichen Itza is perhaps the most visited archaeological site in the Yucatan. I have not seen such crowds anywhere else in Mexico. Thanks to the unique monuments, the creators of which were the Mayans and the Toltecs, the ruins of the city were included on the Unesco World Heritage List. The Temple of Warriors and El Castillo are really impressive, but the biggest impression on me was made by the huge Juego de Pelota or pelota pitch, the largest and best preserved in all of Mesoamerica.