San Andrea al Quirinale and San Carlo alle Quattro Fontane, both very iconic and innovative structures but different from each in many details, techniques, illusions etc. In 1638 Borromini was commissioned to build a church and its monastery on a small and asymmetrical site for Spanish Trinitarians sponsored by Cardinal Barberini, at the crossroads between the Strada Pia and the Strada Felice (now Via del Quirinale), where it would have been built Sant'Andrea al Quirinale by Bernini going down the Strada Pia district, built for the Jesuit seminary. Bernini received the commission in 1658 from Cardinal Camillo Francesco Maria Pamphili. Both churches are iconic Baroque structures