Modlin Fortress (Polish: Twierdza Modlin), called in Russian the Novogeorgievsk Fortress (Russian: Крепость Новогеоргиевск), is one of the largest 19th-century fortresses in Poland. It is located in the town of Nowy Dwór Mazowiecki in district Modlin on the Narew river, approximately 50 kilometers north of Warsaw. It was originally constructed by the French from 1806 to 1812.
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