Chichén Itzá is a large Mayan city famous for a large, pyramid temple built by the Maya civilization. It is on the Yucatán Peninsula, about 120 km to the east of Mérida. The temple, called Castillo, is about 1 km in diameter. There are many temples and pyramids at Chichen Itza. Tourists, or visitors, were once able to climb some of the pyramids, but it was quite challenging because the steps are very steep and small. Climbing is no longer permitted.