Or Qapi

Or Qapi Fortress is a ruined fort located near the settlement of Perekop on the Perekop isthmus connecting the Crimean peninsula to the Ukrainian mainland.

History
Or Quapi Fortress used to be of great military importance as the key to the Crimean Khanate. During the Russo-Turkish War (1735–1739), the Russian field marshal Burkhard Christoph von Munnich successfully stormed the fortifications on June 17, 1736, and left the Tatar fortress in ruins. This was a serious, if not mortal, blow to the independence of the Crimean Khanate.