From a quick Google search you'd want to visit "International War Museum of the World Wars" its got both nazi flags and imperial japan flags and got a 4.9/5 rating on google
Problem is its not exactly close to a city and you'd likely have to commit a drive from Rome or Napoli to get there
Any WWII museums that take Italy's side? Memorials to Mussolini or to the Italian fascists?
Problem is its not exactly close to a city and you'd likely have to commit a drive from Rome or Napoli to get there