Kletterwand/Climbing wall, <a href="//commons.wikimedia.org/wiki/Category:Donauinselfest" title="Category:Donauinselfest">Donauinselfest</a> 2007
<a href="//commons.wikimedia.org/wiki/User:Tsui" title="User:Tsui">Tsui</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>