The Galleria Doria Pamphilj is a private collection still hanging in the house where it was gathered. Four wings of gallery run round a courtyard inside a palace on the Corso, and the walls are covered from floor to cornice, paintings stacked three and four deep. The family that assembled it still lives on the floor above, and the audio guide is recorded by one of them, so the voice explaining the pictures is talking about his own ancestors.
At the end of one wing is a small octagonal room holding a single picture. Velázquez painted Innocent X in Rome in 1650, in only a few sittings: the pope looks hard, watchful and red-faced, in a red cape, gripping the arm of his chair. Bernini's marble bust of the same man, carved at about the same time, stands beside it. It is formal and flattering, and it looks like a different person. The two works are two metres apart, and this is the only place you can compare them.