Once arrived at the intersection with Corso di Porta Ticinese, turn left, cross via San Vito (crossing in cobblestones with a 3 cm step) and continue for about 200 meters to reach the Colonne di San Lorenzo: 16 marble columns, 8 and a half meters tall, with Corinthian capitals supporting the entablature.
These columns come from some Roman buildings dating back to the II / III century after Christ (probably a pagan temple) that were transported to their current location to complete the Basilica di San Lorenzo.
The square is a pedestrian area, with paving stones and access to the church level is possible via two ramps.
The basilica was built in Roman times (between the 4th and 5th centuries), it was the largest central-plan building in the Western World and it was dedicated to San Lorenzo (a martyr) only in 590, when Milano was already under the Lombard rule.
In the parvis, a statue of Emperor Constantine evokes the Edict of 313 which sanctioned the freedom of worship in the Roman Empire. Inside the basilica there are interesting mosaics and the chapel of Sant'Aquilino, which has preserved its original structure.
The wide spaces around the basilica are much loved by the Milanese people, especially by young people, who love to spend their summer evenings there.