Elephant Rock in Castelsardo, Sardinia, Italy. This natural sculpture made by wind and rain has a <a href="https://en.wikipedia.org/wiki/en:Domus_de_Janas" class="extiw" title="w:en:Domus de Janas">Domus de janas</a> inside of it
<a href="//commons.wikimedia.org/wiki/User:Cesco77" title="User:Cesco77">Cesco77</a> Francesco Canu
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>