Fortress of <a href="//commons.wikimedia.org/w/index.php?title=Koporye&amp;action=edit&amp;redlink=1" class="new" title="Koporye (page does not exist)">Koporye</a>, <a href="//commons.wikimedia.org/wiki/Leningrad_Oblast" class="mw-redirect" title="Leningrad Oblast">Leningrad Oblast</a>, <a href="//commons.wikimedia.org/wiki/Russia" class="mw-redirect" title="Russia">Russia</a>. One of the towers as seen from inside the fortress.
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CC BY-SA 3.0
No machine-readable source provided. Own work assumed (based on copyright claims).