Duomo is an interchange station serving the Line 1 and Line 3 of Milan Metro. The station is underground and located in Piazza Duomo, the central area of Milan. It opened in 1964 as part of the Line 1 and from 1990 is a node of interchange with the Line 3.
The platform of Line 3 directed to San Donato has several problems as moisture is at a depth of about 25 meters. Line 1, being older, it runs above Line 3. The Line 3 section is divided into two orthogonal tubes, the northern one being above the southern one.
Nearby the station are the Duomo, the Teatro alla Scala, the Royal Palace and the Galleria Vittorio Emanuele II.
A corridor of the station is in communication (but the passage is closed) with the archaeological excavations of pre-Christian basilica located under the Duomo.
The mezzanine of the station is connected by tunnels that reach the exits of Piazza Cordusio ("Craft Gallery"), Palazzo Reale ("Galleria del Parvis"), Corso Vittorio Emanuele II and the Rinascente in Piazza Duomo.