Horizontal columns of <a href="https://en.wikipedia.org/wiki/phonolite" class="extiw" title="en:phonolite">phonolite</a> at foot of <a href="//commons.wikimedia.org/w/index.php?title=Fredevald&amp;action=edit&amp;redlink=1" class="new" title="Fredevald (page does not exist)">Fredevald</a> (Pustý zámek) castle rock near <a href="https://en.wikipedia.org/wiki/%C4%8Cesk%C3%A1_Kamenice" class="extiw" title="en:Česká Kamenice">Česká Kamenice</a>, <a href="//commons.wikimedia.org/wiki/Czech_Republic" class="mw-redirect" title="Czech Republic">Czech Republic</a>. Some of the colums are over 25 m long.
<a href="//commons.wikimedia.org/wiki/User:Rolf-Dresden" title="User:Rolf-Dresden">Rolf-Dresden</a>
CC BY 2.5
self made by <a href="//commons.wikimedia.org/wiki/User:Rolf-Dresden" title="User:Rolf-Dresden">Rolf-Dresden</a>