20. Castle of Kukulcan, facing the west side of the pyramid. It was so precisely constructed that it is, in reality, an astronomical clock giving notice of the spring and fall equinoxes as well as both the winter and summer solstices. The sun strikes the pyramid during each equinox in such a way as to give the impression of a serpent undulating up or down its surface, depending on the time of year. There are 91 steps on each of the four sides.

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