St. Gellert's Cave is also associated with the first bishop of Hungary. It is part of numerous cave labyrinths hidden in the rock of Buda. Hot springs create a bath in the cave. Today these springs are known as the Gellert Baths and are located in the hotel of the same name. At the time of Gellert, these waters were famous for their healing features, and helped the saint to convert new proselytes to the Catholic faith. Over the years, a monastery arose in the cave and a small chapel added to it. During the German occupation of Budapest, a military hospital was located here. During the communist era, the monastery was closed, and the monks were imprisoned.