El Castillo, Chichén Itzá

El Castillo, also called the Temple of Kukulcán, is a step pyramid at the centre of the Maya city of Chichén Itzá in Yucatán, Mexico, built between about the 9th and 12th centuries. It has four stairways and nine terraces, and at the equinoxes the afternoon sun casts a shadow like a serpent along its northern stairway. A smaller version stood at the later city of Mayapan.