Санта-Мария-ин-Валичелла
At the same time he was witness to the completion of the dome of St. Peter's Basilica in 1590. The architecture of several Roman churches made also a deep impression on him; among them most influential were the first truly baroque façade of the Church of the Gesu, Santa Maria in Transpontina and Santa Maria in Vallicella. He would use their design in his later constructions.