Built in the 17th century as a party house, the Galleria Borghese houses a priceless art collection, including fascinating mosaics, sculptures, paintings and other antiquities by Rubens, Caravaggio, Bernini, Canova, Titian, and Raphael. The gallery is definitely a must-see for any visitor to Rome. As the gallery is very popular, consider booking in advance to make sure the tickets are not sold out.