Reuters calls Rome’s newly opened Colosseo-Fori Imperiali and Porta Metronia stations genuine underground museums, following decades of delays and complex excavations during Line C construction.The Colosseo-Fori Imperiali complex reaches about 32 meters under the Colosseum and displays roughly 350 artifacts on site while Porta Metronia exposes a restored second-century barracks and frescoed residence viewable from an elevated walkway, with access to the underground museum sold for a 1.50-euro ticket.Officials and builders including Matteo Salvini, Roberto Gualtieri and Marco Cervone say the openings balance rapid transit and heritage preservation as Line C advances toward a roughly 29-kilometer route with 31 planned stations and a projected capacity of up to 800,000 passengers daily.