While the exterior is austere and has a portico and dome that recall the
Pantheon in Rome; the interior, including the ceiling of the dome, is highly decorated in a
Baroque fashion. The entrance portico has three arches flanked by walls with decorative
Doric pilasters. Originally the portico cornice had the script stating
Beatae Mariae Virgini Dei Matri in Caelum Assumptae (Blessed Mary Virgin Assumption as Heavenly Mother), along with a coat of arms of Pope Alexander VII. The circular church appears to have stood independently at the site upon construction. The two flanking wings that encircle the church were built in 1771 under the patronage of Prince Sigismondo Chigi; they were not part of Bernini's design. This reconstruction altered the cornice to read
Deiparae in Coelum Assumptae Mother of God in Heaven after Assumption. Inside the portico, above the door, is a star in a circle with the inscription of
Stella matutina ora pro nobis (Morning Star pray for us). The buildings at the wings have two-story rectangular porticos with entrances flanked by double pilasters. In the piazza in the front are two fountains. In 1778, a rededication included lateral altars in the church dedicated to the Holy Trinity and St Augustine of Ippona. Further reconstruction was performed in the last century to the structures, repairing damage done by bombardments during World War II, and repairing damage to exterior stucco. ==Interior==