On the occasion of World Museum Day on May 17th and 18th, the Papal Palace in Castel Gandolfo, converted into a museum by Pope Francis, will open its doors to visitors in three rooms: the Billiards Room, the Television Room, and the Music Room. The Billiards Room was created in the 18th century in a salon commissioned by Clement XIV and decorated with frescoes by Giovanni Angeloni. The frescoes depict the Pope relaxing. The article, "Castel Gand…