El Castillo (Pyramid of Kukulcan), Chichen Itza, Mexico — This 30-meter pyramid has four staircases of 91 steps each, totaling 364, plus the top platform for 365 — matching the solar calendar. At the equinoxes, the setting sun creates a shadow serpent that appears to descend the northern staircase toward the stone snake head at its base.
© El_Castillo_Stitch_2008_Edit_2.jpg: Fcb981
Chitzen_Itze.JPG: Cafrica
Chichen_Itza_3.jpg: Daniel Schwen
derivative work: — raeky (talk | edits), CC BY-SA 3.0, via Wikimedia Commons
