If the 18th century invented the large, wrap-around painted panorama, then there are plenty of broad views of Rome to help our studies:

Maarten van Heemskerck, panorama of Rome from Monte Caprino, of the 1530s. In Berlin? cf. Huelsen & Egger 1913-16;
Series Italie a vol d'oiseau (with one of Piazza del Popolo lithograph coloured by A. Guesdon), circa 1860;
Roma veduta a volo d'ucello, anon print c.1850; cf. Bibl. Ist.Naz Arch. St. dell'Arte Roma XI, 42, tav 66; reproduced in Ciucci, p.120;
panorama of the Quirinal Hill. Fresco in Lateran Palace, 1588. Reproduced in Gamrath 1987, fig.85;

For the history of the panorama, cf. van Eekelen 1996; for a much fuller treatment, cf. Oettermann 1997;