- foursquare.com cityofpoznan/list/twierdza-poznań…Muzeum Armii Poznań is one of Twierdza Poznań // Poznań Fortress. ... Makieta Dawnego Poznania is one of Twierdza Poznań // Poznań Fortress.
- wikidata.org wiki/Q50127dawiki Fæstningen Poznań. dewiki Festung Posen. elwiki Φρούριο του Πόζναν. enwiki Poznań Fortress. eswiki Fortaleza de Poznan (Polonia).
- Mamy dla Was wiadomość Właśnie zostały ogłoszone daty XII Dni Twierdzy Poznań | 12th Poznań Fortress Days.
- wblog.wiki nn/Poznań_FortressPoznań Fortress, known in German as Festung Posen (Polish: Twierdza Poznań) was a set of fortifications in the city of Poznań (German: Posen) in western...
- staypoland.com about_poznan.htm/The city experienced intense industrial growth and became an important military centre for Prussia, known as Festung Posen (Fortress Poznan).
- its-poland.com attraction/poznan-fortress-daysPoznań Fortress Days is an annual event organized by the Poznań Local Tourist Organization together with partners.
- poland.travel en/monuments/fortifications-in-…In the years between 1828 and 1869 a vast fortress was built in Poznan, one of the largest fortifications of this type in Europe.
- ru.wikibrief.org wiki/Poznań_FortressO 40fikacjach miasta Poznania w XIX i XX wieku., Познань 2006, Wydawnictwo Rawelin, ISBN 83-915340-2-2.
- commons.wikimedia.org wiki/Category:Days_of_…Days of Fortress Poznań (2016) (30 F). I. II Dni Twierdzy Poznań 2-3 VII 2014 (12 F).