St Vitus Cathedral is the metropolitan church of the archbishopric of Prague.
That the castle is a centre of both secular and clerical power is demonstrated by the double towers of St. Vitus Cathedral which rise to a height of 96 m. Many Czechs see the cathedral as a national treasure. Entry to the building is free. The "St. Cyril and Methodius" window in the third chapel is also noteworthy. It was commissioned by a bank and designed by Art Nouveau artist Alfons Mucha.