Hello again amigos!!!
After a long time, a souvenir for all of you from Yucatn, just named a "new wonder"
You can see, in the left side, the Kukulcan phenomenon, which is a shadow snake coming down the stairs to the base of the piramid...Only seen during the vernal/autumnal equinox.
For more information:
http://en.wikipedia.org/wiki/El_Castillo,_Chichen_Itza