Sant Andrea della Valle – Roman Basilica located in the district of Sant Eustachio on Piazza Vidoni at the intersection of Corso Vittorio Emanuele and Corso Rinascimento. This is the main Church of the monastic order of theatines.

The establishment of the Church was conceived when Donna Costanza Piccolomini d'aragona, Duchess of Amalfi and a descendant of the family of Pope Pius II, bequeathed his Palace and the adjacent Church of San Sebastiano in Rome of the order of theatines. As the patron Saint of Amalfi, Saint Andrew is considered, once it was decided that a new Church would bear his name. Work began in 1590 – worked on a project architects Giacomo della Porta and pier Paolo Olivieri, and patronized them cardinal Gesualdo. In 1608, after a break, the construction resumed – he was joined by Carlo Maderno, who created an even more ambitious project. Interior decoration of the Church was completed in 1650.

The attraction of the Church is its dome. To paint the dome frescoes, fought Giovanni Lanfranco and Domenichino, both disciples of Karachi. In 1608 cardinal Alessandro opted for Lanfranco, however, Pope Gregory XV preferred the Bolognese stole Domenichino. In the end, both artists were hired. Luxurious decoration Lanfranco, completed in 1627, became a role model for the next few decades. And Domenichino had a hand in the decoration of the apse of the Church. The dome itself for a long time was considered the third largest in Rome after the domes of St. Peter's Basilica and the Pantheon.

Inside the Church are noteworthy chapels worked outstanding masters of his time, - chapel Dinette with sculptures by Antonio Raggi, Strozzi chapel with bronze copies of Michelangelo statues, they also designed the chapel of the Madonna della purità beach with the tomb of the Martyr St. Fortunato, round chapel to the left of the entrance to the tomb of Pope Pius II, etc.