The stunning ruins of Chichén Itzá are evidence of a sensational ancient city that was the centre of the Mayan Empire in Central America. The largest and the most impressive of Mayan ruins, Chichén Itzá today has become the most prominent tourist attraction in Mexico. And the step pyramid, the one that is the most recognisable monument in the area, is called Kukulkan's Pyramid or El Castillo. These ruins are a great reflection of the advanced stage of science and astronomy that the Mayan culture was capable of. The step-pyramid itself has 365 steps, one each for every day of the calendar!