In reality at the time it was simply via Ostiense , piazzale Ostiense would only arrive in 1920 . The photographer positioned along the dirt road shows us the Pyramid of Cestius on the left and Porta San Paolo in front. Some people strike a pose, others seem distracted. In the background, towards the gate, a couple of carts heading towards the city centre . Here you can see a topographical map of the suburb of Rome almost contemporary with the photo and which also shows the building ( Osteria agli Amici ) near the gate.

Piazzale Ostiense

Following the proclamation of the Kingdom of Italy, the Industria Bridge was built in the early 1960s, linking the areas of Ostiense and Portuense, divided by the River Tiber. At first Ponte San Paolo and used for railway mobility, it was replaced by a newly built bridge at the beginning of the 20th century, passing to another use. Nowadays it is known to the Romans simply as the Iron Bridge and serves road transport and pedestrian mobility.
Ancient Porta Ostiensis. On the side it is possible to see the Pyramid of Cestius, a mausoleum tomb from Ancient Rome, both imperial constructions
Etymologically it derives from the Latin term “hostia”, that is “victim”. The area of the Ostiense district was born close to the historic center of Rome, specifically, the ancient Aurelian Walls, as a Roman military access to the waters of the sea. However, Ostiense took its name from the ancient “Porta Ostiensis” (which soon fell into disuse, in favor of other ancient Roman gates), from which extends via Ostiense connecting the Aventine hill of the city of Rome, to the coast of Ostia, which must to have been the first real military success of the ancient Romans. (wiki)