Rotunda, ob. Muzeum Martyrologii Rotunda (1825-31 r.)

A round brick-and-stone fortification built in 1825–1831 as a gun emplacement of the Zamość fortress, 54 metres across, with cells opening onto an inner courtyard. From 1940 to 1944 it was a German Gestapo camp, a place of suffering and execution for people of the Zamość region. Today it is a museum of martyrdom commemorating the victims.