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The Maya would often build newer bigger temple-pyramids atop older ones. Archaeologists have constructed tunnels allowing a view of the earlier temple of Kukulcan inside the later one. Go in the door at the foot of the north stairway, and you can go up a steep interior stairway up to the room on the top where you can see King Kukulcan's Jaguar Throne, carved of stone and painted red with jade spots. It is an impressive sight, but the climb up the narrow interior passageway may be too much for those with some claustrophobia. Since 2006, you cannot climb the steps to the top of the most of the monuments. These areas have been roped off due to erosion and destruction of some of the sacred monuments.
El Castillo
The most famous landmark of Chichen Itza. This was a temple-pyramid dedicated to the Feathered Serpent God, Kukulcan. It is nicknamed "The Castle". Sculptures of the Feathered Serpents run down the sides of the northern staircase, and are set off by shadows from the corner tiers on the Spring and Fall equinox. (Since 2006, you can not climb El Castillo.).
circular temple on a rectangular platform, also sacred to Kukulcan, served as an astronomical observatory. .
palace with hieroglyphic inscriptions.
Where a large selection of ancient pottery and idols may be seen still in the positions where they were left in Pre-Columbian times.
Beautiful cenote where you can jump from the "cliff" into the sparkling waters. Changing rooms, showers, lockers available. About 3 km from the archaeological site.