Church of Santa Maria della Concezione dei Cappuccini

The church of Sant'Isidoro a Capo le Case, part of a Franciscan complex, is one of the two Irish national churches. The church and monastery were built between 1622 and 1672, when Spanish Franciscan descalceati (Discalced) arrived to found a convent for their countrymen and built the church which they dedicated to the new Spanish saint. A few years later, the church and convent came under the authority of Irish Franciscan monks, fleeing their country under the persecution of the English Protestants.

The Church of San Carlo alle Quattro Fontane is a baroque church built between 1634 and 1644 by Francesco Borromini. The facade of the church on the street was designed and built much later, from 1664; after the architect's death in 1667, the work was continued from 1670 to 1680 on the basis of Borromini's drawings.

The Basilica of Sant'Andrea delle Fratte was built between 1653 and 1662 but a church already existed on the site in the 11th century. The Baroque reconstruction of the 17th century is the work of Francesco Borromini, but the façade dates back to 1862. The church is the place where the famous conversion of Alphonse Ratisbonne (1814-1848) took place.