Zaraysk Kremlin (fortress) built
1528 CE.
Shown on the map at 54.757°, 38.872°.
The Zaraysk Kremlin is a rectangular fortified citadel, built at the behest of Vasili III of Moscow between 1528 and 1531. The town of Zaraysk is located between Moscow and Ryazan.
Text from the Wikipedia article Zaraysk Kremlin, licensed CC BY-SA 4.0.