One of the most remarkable features of the Kukulkan pyramid is its alignment with the sun during the spring and fall equinoxes. As the sun sets, a shadow in the shape of a serpent’s body appears on the northern staircase, as seen in this photo. The shadow ‘connects’ to the huge stone serpent head at the bottom of the staircase, creating the illusion of a huge slithering snake. This is Kukulkan, a feathered serpent god and a bringer of rain and winds.

Now discover the incredible pyramids that aren't in Egypt...

The incredible story of Mexico's ancient pyramids