Museum RockArt, <a href="https://en.wikipedia.org/wiki/Hoek_van_Holland" class="extiw" title="w:Hoek van Holland">Hoek van Holland</a>, <a href="https://en.wikipedia.org/wiki/Netherlands" class="extiw" title="w:Netherlands">Netherlands</a>
<a href="//commons.wikimedia.org/wiki/User:Ymnes" title="User:Ymnes">Ymnes</a>
<span class="int-own-work" lang="en">Own work</span>