Eisriesenwelt, the biggest ice-cave of the world, near Werfen in Austria
<a href="//commons.wikimedia.org/wiki/User:MatthiasKabel" title="User:MatthiasKabel">MatthiasKabel</a>, modified by <a href="//commons.wikimedia.org/wiki/User:Werckmeister" title="User:Werckmeister">Werckmeister</a> / <a href="//commons.wikimedia.org/wiki/User:Wildfeuer" title="User:Wildfeuer">Wildfeuer</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>