Monolith of the Stone of the Sun, also named Aztec calendar stone (National Museum of Anthropology and History, Mexico City).
<a href="//commons.wikimedia.org/wiki/User:El_Comandante" title="User:El Comandante">El Comandante</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>