Beautiful panorama on the Aventine (before 1918), in fact, Ponte Sublicio is not present. Given the height, the photo was presumably taken from Palazzo Caffarelli on the Campidoglio . A solitary tram travels along the Lungotevere and in the distance you can see the first buildings built in the Testaccio district . On the other hand, the walls under the Aventine are missing and will be completed by the Municipality of Rome in 1926.

Panorama on the Aventine (before 1918)

Same view today

Panorama on the Aventine (before 1918)

Testaccio is a typical example of industrial urbanization, born as a residential settlement, separate and close, connected to places of production: the district within the walls was born, in fact, as a residential offshoot intended for the workers assigned to the activities who settled along the via Ostiense from the end of the 19th century. From this point of view it is a unique example of planned urbanization in Rome.
Already the first regulatory plan of Rome capital, in 1873 , envisaged that the industrial expansion of the city should take place in the Ostiense area: this choice was favored by the flat territory and the presence of various communication routes – the via Ostiense precisely, the river with the port of Ripa , and the railway. (wiki)