Marcel Stoklasa: ?. Sandstone. 2015. Picture taken in Nečtiny, Plzeň-North District, Czech Republic.
<a href="//commons.wikimedia.org/wiki/User:Art_Jarka" title="User:Art Jarka">Art Jarka</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>