entrance of the <b>unicorn cave</b> in Scharzfeld near <a href="https://en.wikipedia.org/wiki/Herzberg_am_Harz" class="extiw" title="en:Herzberg am Harz">Herzberg</a> in Lower Saxony.
<a href="//commons.wikimedia.org/wiki/User:Norbert_Kaiser" title="User:Norbert Kaiser">Norbert Kaiser</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>