<a href="https://en.wikipedia.org/wiki/en:Belogradchik_Fortress" class="extiw" title="w:en:Belogradchik Fortress">Belogradchik Fortress</a>, lithography by <a href="https://en.wikipedia.org/wiki/en:Felix_Philipp_Kanitz" class="extiw" title="w:en:Felix Philipp Kanitz">Felix Philipp Kanitz</a>.
<bdi><a href="https://en.wikipedia.org/wiki/en:Felix_Philipp_Kanitz" class="extiw" title="w:en:Felix Philipp Kanitz"><span title="Austro-Hungarian archaeologist (1829-1904)">Felix Philipp Kanitz</span></a>
</bdi>
1860s <div style="display: none;">date QS:P,+1860-00-00T00:00:00Z/8</div>
"Danubian Bulgaria and the Balkans", Bulgarian translation, volume I, Publishing house Bulgarian Historical Library, Sofia, 1932, pictorial appendix.