Rome's most important and prestigious collection of art, housed in a beautiful XVIII-century palace which was the residence of the Barberini family. There are a large number of works by Italian artists from the XIII and XIV centuries, and the XVIII-century apartments can be visited. Free guided tours of the nobles' floor with the XVI-century Sala della Collezione and the Sala di Piazza da Cortona, with collections from the XVII century. Booking in advance is advisable.