The cathedral has an old Gothic altar from the end of the 15th century. It also has an early baroque altar from the 17th century. There is a portrait of St. Antoním by Petr Brandla, a pastoforium made by Matej Rejsem and a pulpit by Josef Myslbek. Under the cathedral are 3 crypts. There is a legend about one of them. In the legend, Jan Žižka z Trocnova, a famous Hussite commander, was buried there for a short time. In the towers are 4 bells named Leopold, Klement, Václav and Michal.