What is Poznań Fortress?
[[File:Fort 4a Poznań 1.jpg|thumb|250px|Fort IVa]] [[File:Śluza Katedralna Poznań RB1.JPG|thumb|250px|Cathedral Lock]] '''Poznań Fortress''' (in [[Polish language|Polish]]: ''Twierdza Poznań'', in [[German language|German]]: ''Festung Posen'') was a set of [[fortification]]s in the city of [[Poznań]] in western [[Poland]], built under [[Kingdom of Prussia|Prussian]] rule in the 19th and early 20th centuries. It was one of largest systems of its kind in [[Europe]]. {{commonscat|Twierdza Poznań}} {{Europe-stub}} [[Category:Buildings and structures in Poznań]] [[Category:Fortification]] [[Category:Buildings and structures completed in the 20th century]]