Its southern facade is in front of the basilica Sant'Andrea delle Fratte, whose cupola and the bell were the work of Borromini.

The main facade was created by Bernini (1644),[1] and the front side of the via di Propaganda by Borromini (1646).

[3] The building houses the Museo Missionario di Propaganda Fide, highlighting 400 years of missionary work.

A plaque above the doorway displays the coat of arms of Urban VIII, with Barbarini bees, Papal tiara and keys.

[1] Composed of pilasters, and alternating concave and convex curves in the windows design, it is one of the most famous examples of Italian Baroque architecture.