Remnants of an early tower are incorporated into this post-war building.
The tower has a height of approximately 9 meters, of which 2.5 meters are below ground level. It was one of the two side towers people passed between when entering the city. It was one of the gates in the oldest city walls which were 3,500 meters in length. These were built in times of peace between the end of the 1st century C.C. and the beginning of the first century A.D.
The tower is built in brickwork with the inside composed of pebbles and mortar. Several courses of stone blocks are at the base. The tower was octagonal on the outside and circular on the inside.
The ancient gate, possibly with two arches, opened on to a bridge spanning a ditch surrounding the walls on the outside and connected with two main roads as it still does today. One is the road to Ticinu,/Pavia and the other goes to Habiate/Abbiategrasso. The name “Carrobbio” derives directly from the Latin quadrivium, meaning the junction of four roads.
