Inside the church of Sant'Ignazio di Loyola, not far from Via del Corso, there is an incredible "fake dome" created by Andrea Pozzo in 1685. Why this dome is fake? Because it is a canvas of 17 meters of diameter on which Pozzo painted the extraordinary illusionistic effect of a dome which...isn't there! On the pavement there is a marble dish which indicates the exact point of observation of this perspective effect. It seems that a real dome has never been realised because when the works of the church were ongoing the funds for the dome weren't sufficient to complete it.