Reproduction of <a href="https://en.wikipedia.org/wiki/en:cave_of_Altamira" class="extiw" title="w:en:cave of Altamira">cave of Altamira</a> in "Deutsches Museum" Munich
<a href="//commons.wikimedia.org/wiki/User:MatthiasKabel" title="User:MatthiasKabel">User:MatthiasKabel</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>