Sondrio is a station of Line 3 of Milan Metro, whose inauguration took place on May 12, 1991, more than a year after the opening of the original trunk of the line to the public. It was the final stop of the line until 1995, when Zara (Milan Metro) was opened. The station is located in Via Melchiorre Gioia at the intersection with Viale Sondrio, in the municipality of Milan. The station is underground, it is built on a single rod with two trucks, and it is sometimes flooded.