San Lorenzo is Rome's student quarter, and it is the part of the city that was bombed. On 19 July 1943 around five hundred American bombers came over Rome for the first time; the target was the rail yard, and the bombs fell on the quarter built around it. About three thousand people were killed in a few hours, and the front of the basilica of San Lorenzo was torn off. Pius XII drove out of the Vatican that afternoon and stood in the crowd outside the church.
Six days later the Fascist Grand Council voted against Mussolini and he was arrested. The quarter was young when it happened: laid out from the 1880s outside the city wall, in plain blocks on a grid, for the men who worked the railway and the huge new cemetery next door. The rebuilt basilica shows its history in the stonework, and from the forecourt you can see where the medieval porch ends and the postwar repair begins. Today San Lorenzo is loud after dark and covered in political posters and murals, and it looks like nowhere else in Rome.