Milan is known for its opera, fashion, and banking – not its ruins. And yet the city has Roman ruins – including the Columns of San Lorenzo (Colonne di San Lorenzo). These well-preserved ruins all date from the 2nd century, when they were part of a Roman building (experts aren't sure whether it was a bath house or a temple). They were likely moved to their current location in the 5th century.
The 16 columns line one side of a piazza in front of the fifth-century Basilica di San Lorenzo, one of Milan's oldest churches. They were brought to the piazza when the church was complete.
The Colonne di San Lorenzo are on Corso di Porta Ticinese, southwest of the Duomo in the historic city center.