Villa Torlonia Bunker

As WWII loomed, Mussolini, living in the Casino Nobile at the time, had multiple bunkers built underground. Fascinating 1½-hour tours take you down into these bare underground chambers, complete with anti-gas doors and air-filtration systems, with interesting projections showing Mussolini's family life. The bunker, whose 4m-thick walls lie 6m below the villa, was still being worked on when 'the Duce' was arrested on July 25, 1943. Tours are in Italian or English; book ahead.