Płock lies on the bank of the Vistula River, in the central part of Poland, about 120 km west of Warsaw. Płock was the capital of Masovia and for a short period at the end of the 11th century and the beginning of the 12th century it was a residence of Polish kings.
Płock has some fine monuments. The Cathedral of Our Lady was built in the 12th century in the Romanesque style and later reshaped in the Gothic and Renaissance styles. The fragments of the castle of the Mazovian Princes’ can also be seen. The museum in the castle features an Art Nouveau exhibition.