Vicolo Aquila Nera (Black Eagle Alley) is home to one of the most extensive archaeological areas, found by chance in the 1980s during the construction of a warehouse for the Angelo Maj Library. The site presents a true millennia-long cross-section in a portion of the slope occupied from the 5th century B.C. until 1800: the oldest traces refer to the settlement of the Golasecchian Celts.
In the Middle Ages the New Monastery stood in this area, and the remains of pipes, glazed and graffitied ceramic vessels and furnishings of a pipe workshop are found nearby.