In the event that time permits only one gallery in Rome, then without a doubt the Galleria Borghese Villa should be the final option. This is because it houses a wonderful collection of Renaissance and early Baroque masterpieces located within the picturesque Villa Borghese park. Notable among them are several paintings by Caravaggio, Titian, and some amazing sculptures by Bernini. Make sure to reserve your place in advance as there are restrictions on the number of people allowed in at one time.