The donjon ruines in the <a href="https://en.wikipedia.org/wiki/Ch%C3%A2teau_de_Coucy" class="extiw" title="en:Château de Coucy">Château de Coucy</a>
<a href="//commons.wikimedia.org/wiki/User:Roi_Boshi" title="User:Roi Boshi">Roi Boshi</a>
<span class="int-own-work" lang="en">Own work</span>