Santa Maria del Popolo
The architect or architects of this innovative project remain unknown due to a lack of contemporary sources. Giorgio Vasari in his "Lives" attributed all the important papal projects in Rome during Sixtus IV to a Florentine, Baccio Pontelli including the basilica and monastery of Santa Maria del Popolo. Modern researchers deemed this claim highly dubious and proposed other names among them Andrea Bregno, a Lombard sculptor and architect whose workshop certainly received important commissions in the basilica. The fundamental differences between the façade and the interior suggest that maybe more than one architect was working on the building.
Palazzo Wedekind
On a site occupied in antiquity by the Temple of Marcus Aurelius, the medieval buildings on the site were cleared for a structure erected by the Ludovisi (1659) that became the offices of the vicegerente of the vicariate of Rome. To house the general director of the postal service for the Papal States, moved here in 1814, the palazzo was completely rebuilt by Pope Gregory XVI to designs by Giuseppe Valadier carried out by Pietro Camporese the Younger. At Valadier's urging, Camporese added a portico built with twelve elegant Roman columns brought from the ruins of Veii, supplemented with two pairs of columns flanking the main doorway, retrieved from the basilica of San Paolo fuori le Mura, which burned in 1823.