Pusterla di Sant'Ambrogio

The Pusterla di Sant’Ambrogio is a minor or secondary gate in the Medieval walls of Milan; the rebuilt Romanesque-style tower and pedestrian arches is located on Via Carducci #41, near the Castello Cova and some 50 meters west of the entrance of the Basilica di Sant'Ambrogio in the center of Milan, region of Lombardy, Italy.

The medieval walls of Milan were constructed after multiple disasters had devastated Milan, including 11th-century urban fires and a highly destructive sack by the emperor Barbarossa in 1162. This postern was one of the ten secondary gates and until the 1930s, its outer face was near the bank of a navigli, which ran along the present via Carducci.

Source: Wikipedia