 The most interesting building from post-war period is Pałac Kultury i Nauki.Historical monuments elsewhere include the manor house in Żelazowa Wola where composer Frédéric Chopin was born and his museum is located nowadays.Płock, once the seat of the Mazovian princes, and Łowicz, the residence of the archbishops of Gniezno, are noted for their cathedrals.