Giovanni XXIII Tunnel
The 302nd longest tunnel in the world
Giovanni XXIII Tunnel (also called Passante a Nord-Ovest) is a road tunnel in Rome, Italy, that is part of the Tangenziale Est road. It is about 2.9 km (1.8 mi) long. The twin tunnels form a dual carriageway running under the Monte Mario hill, connecting the northwest zone to northeast zone of Rome. The tunnel was officially opened on 22 December 2004. During the construction, ostracod fossils were discovered. The tunnel is toll-free.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).