Dominating the landscape is the temple of Kukulkan, the Maya Feathered Serpent Deity. This massive four faced pyramid measures about 53.3 meters along each side, from the center of which rises a steep stair to the ceremonial platform on top. On the northeastern face, flanking the base of the staircase, are sculpted heads of serpents. During the spring and autumn equinoxes festivals are held to watch the dying sun align with the terraces of the pyramid, casting a shadow along the balustrade, giving the illusion of a snake descending the steps. Put in a photo of the snake The sight of many standing in front of the Kukulkan pyramid madly clapping their hands is a bit strange until you arrive and begin to do it yourself. The clap produces and echo, designed to sound similar to the quetzal bird’s cry. It is amazing to imagine the ancient times, the grounds filled with people all rhythmically clapping and the air filled with the echoes of the quetzal cry. www.ablogvoyage.com/2012/06/24/chichen-itza-yucatan-mexico/