El Castillo, at the Maya town Chichén Itzá, in Yucatán, in Mexico.
<a href="//commons.wikimedia.org/wiki/User:Fandecaisses" title="User:Fandecaisses">Fandecaisses</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>