When the New Lvov Gate was built in 1821 the Old Lvov Gate was turned into casemates. Above the portal traces of an inscription „PRISON” are still visible; the inscription dates back to the times of the Congress Kingdom of Poland. Next to the exit there is a plaque with a low-relief of Walerian Łukasiński’s (1786 -1868) bust. Łukasiński was a patriotic activist and the founder of National Masonry and Patriotic Society (Wolnomularstwo Narodowe i Towarzystwo Patriotyczne); he was a prisoner in Zamość fortress from 1824 – 1825. The plaque features Łukasiński as a prisoner chained to a heavy gun with an inscription „There is no force that could defeat a true love for the country”.