125,000 inhabitants, is set in the picturesque landscape on the banks of the Vistula. Although today an oil-processing centre, the city can boast a sizeable number of historic treasures. A complex of burgher houses dating from the 18th and 19th centuries forms the old town. The town hall raised in 1825 is one of the finest examples of neoclassical architecture in Poland. The cathedral on the Tumskie Hill (Wzgórze Tumskie) dates back to the first half of 12th century and is the oldest settelment in Mazovia, and was the residence of the first Polish king, a bishopric and a commercial center on the Wisla waterway. it suffered severely from Swedish invasion and lost its importance. The highlights of the town include medieval Cathedral, the Regional museum of Art Nouveau.