The pope also set the Pontifical States' finances on much steadier ground. Pius is best remembered in connection with the expansion of the Pio-Clementine Museum, which was begun at the suggestion of his predecessor Clement XIV; and with an attempt to drain the Pontine Marshes, but Pius VI did successfully drain the marshes near Citta della Pieve, Perugia, and Spoleto. He also restored the Via Appia. Pius VI also deepened and expanded the harbors of Terracina and Porto d'Anzio, a major center of Pontifical trade. Pius was a great patron of the arts and humanities; he also added a new sacristy to St. Peter's Basilica.