Nature reserve "Naturschutzgebiet Altkönig", western slope of the Altkönig mountain. In the center of the picture the remains of the outer wall from the celtic hill fort can be seen. Low mountain range "Taunus", Germany.
<a href="//commons.wikimedia.org/wiki/User:Johannes_Robalotoff" title="User:Johannes Robalotoff">Johannes Robalotoff</a>
CC BY-SA 3.0 de
<span class="int-own-work" lang="en">Own work</span>