Rotunda of St. Nicolas in Cieszyn is the one of the oldest buildings in Poland. Its image is placed on the reverse of 20 zł banknote. It was built in XI century from limestone as a castle church and for many centuries also parish church of Cieszyn (until XIV century it was the only church in this city). Round nave is covered with the stone dome. Altar is placed in the apse, visible in the picture. In 1839 Rotunda was converted into romantic pavilion with large windows. The present state of the building is the result of the preservation works in 1947-1955 which restored its original character. Nowadays rotunda functions as a sacral place in which the masses are said only once a year, in the St. Nicolas day, on the 6th of December.