Lake Albano is a small volcanic crater lake in the Alban Hills of Lazio, at the foot of Monte Cavo, 20 km southeast of Rome. Castel Gandolfo, overlooking the lake, is the site of the Papal Palace of Castel Gandolfo. From Wikipedia
Scheduled from July 6 to 20, the retreat will pause Vatican audiences; include two public masses on July 13 and 20; prompt businesses to prepare for a tourism surge.