The 360 photo shows the main gate of the Castle of Pandino, one of the best examples of the Visconti-type castle of 14th century. The Visconti family was ruling Milan at that time and this castle was part of the defensive belt. It has a perfectly squared plan with four towers of different heights at the corners. The castle is in the center of the town and it is well preserved also in some internal original frescoes.
The area of current Lombardy was settled at least since the 2nd millennium BC, as shown by the archaeological findings of ceramics, arrows, axes and carved stones... continues on wikipedia