San Lorenzo is the Rome the postcards never reach: a working students' quarter wedged behind Termini and the city wall, where the bars stay open late and the walls get repainted faster than anywhere else in the city. It grew up around the railway and the basilica, took a bomb in 1943, and rebuilt itself scruffy and self-possessed.
Start at Porta Tiburtina, the old gate, and cross under the tracks. The grid opens out — Via dei Sabelli and the side streets carry the painted layers, political stencils under big murals under tags. Work towards Piazza dell'Immacolata, the square the students fill after dark; take a table and a drink and let the quarter assemble itself around you.
Then the older Rome. The Basilica di San Lorenzo fuori le Mura is one of the seven pilgrim churches, its portico frescoes and Cosmatesque floor worth the quiet detour. Next door, the monumental gate of the Cimitero del Verano opens onto an avenue of cypresses — read it from the forecourt if you'd rather not go in. Double back to the brewery bars to end. The tram from Verano takes you out whenever you're ready, which won't be early.