This mammoth fortress is on the border between Silesia (modern day Poland) and Moravia (The Czech Republic).
Built on the orders of Frederick the Great of Prussia, between 1765 and 1777 to control the Eulengebirge Pass, the principal architect was Ludwig Wilhelm Regelera.
|The fortress has the massive donjon, four separate forts and seven other works and measures 3 km across|
|The fortress had a garrison of 4000 men and 264 pieces of artillery|
|This photo looks pre-WWII, before the wartime damage|
|Fort Ostrog, bottom right in the plan|
Various improvement works were carried out in the 1800's but the fortress fell into disuse in the 20th century Some restoration work has been undertaken more recently. The fortress was never taken.
The photos I took from Google Images and are uncredited, but I would like to thank the photographers.