The Old Town of Bielsko is the oldest part of the downtown. It is located on Town Hill. It has preserved a medieval urban layout. Beside old arcaded town houses there are the castle of the Sułkowski Dukes and the Cathedral of Saint Nicholas within the Old Town. This part of the city, which was originally surrounded with defence walls, is currently limited by Chrobry Square (Plac Chrobrego) and Orkana, Waryńskiego, Zamkowa, Św. Trójcy Streets.