Built on a rocky outcrop 50 metres above the river Sarine (Saane). In 1924 the former parish church became a cathedral. Built in four campaigns between 1283 and 1490. It is a High Gothic pillared basilica with a façade tower (h. 76 m). Its choir, originally rectangular, was rebuilt in polygonal form (1627-1631). The main portal is surmounted by a tympanum depicting the Last Judgement, framed by archivolts with angels, Prophets and Patriarchs. The cathedral has a unique collection of Jugendstil stained-glass windows (1895-1934) by Józef Mehoffer.