Classical Roman, Greek & Egyptian sculptures & Renaissance art in Michelangelo-designed palaces. By the time the public was given access to the Capitoline Museums in 1734, popes had been amassing this peerless collection of artworks for some 250 years.
The gems are now spread through two palazzi on opposite sides of the Michelangelo-designed Piazza del Campidoglio. In Palazzo dei Conservatori, the courtyard is home to pieces of colossal statues. Inside are works ancient and modern, including Rome’s emblem, a bronze Etruscan (or perhaps medieval) she-wolf suckling twins Remus and Romulus, Bernini’s remarkable statue of Pope Urban VIII, a picture gallery with paintings by Caravaggio, Tintoretto, Titian and others, and the second century AD equestrian statue of Marcus Aurelius (the one in the piazza outside is a copy). Accessed via the Tabularium, with its view along the Forum, the Palazzo Nuovo is home to a superb collection of ancient statuary. On entry you have the option of paying €2 more for a ticket that includes access to the wonderful Centrale Montemartini, which I highly recommend visiting if you have time.