Ferdinand I continued the construction of the piazza but converted the finished product into the church one sees today. He dedicated it to Saint Francis of Paola, who had stayed in a monastery on this site in the 16th century. The church is reminiscent of the Pantheon in Rome. The fašade is fronted by a portico resting on six columns and two Ionic pillars. Inside, the church is circular with two side chapels. The dome is 53 metres high.