The extensive baroque campus - built from the half of the 16th century till the half of the 18th century. It was the Jesuit College. Nowadays it is a seat of the National library and the State technical library. The Astronomical Tower and Baroque library hall are making part of this campus, open to the public from 2000. In 1775 the systematic meteorological and climatic measurement was started in the Astronomical Tower and serves to this purpose till today.