Chiesa di Sant’Andrea della Valle

Crowned by the second-highest dome in Rome after St Peter's, this soaring 17th-century church is one for opera fans – it's in a chapel here that Giacomo Puccini sets the first act of Tosca. Its echoing baroque interior, capped by Carlo Maderno's 1608 cupola and bathed in yellow light, harbors some striking decor. Notable features include a series of frescoes by Matteo Preti and Domenichino, and, in the dome, Lanfranco's heady depiction of heaven, Gloria del Paradiso (Glory of Paradise; 1625–28).