Kukulcán pyramid Chichen Itza. Mexico

Usually referred to as El Castillo ("the castle"). This step pyramid stands about 30 metres high and consists of a series of nine square terraces, each approximately 2.57 metres (8.4 ft) high, with a 6-metre (20 ft) high temple upon the summit. Inside the temple chamber was a Chac Mool statue and a throne in the shape of Jaguar, painted red and with spots made of inlaid jade On the Spring and Autumn equinoxes, in the late afternoon, the northwest corner of the pyramid casts a series of triangular shadows against the western balustrade on the north side that evokes the appearance of a serpent wriggling down the staircase, which some scholars have suggested is a representation of the feathered-serpent god Kukulkan. (Wiki)