Mussolini and I (TV Mini-Series 1985)

Can anyone tell me the name and location of the beautiful house which appeared in this film? It is probably near Rome, but I have never seen it in anything else and it is so spectacular that I am really intrigued as to its whereabouts and a bit about its history. I have also enjoyed the first part of the four part showing of this film and despite comments on the acting, I find it interesting for the historical and social comment on the times. I found the Hitler character unrealistic, but thought Bob Hoskins put in a good performance. I would be grateful for any information on the background to this film. I thought it captured the period and style of the era very well, and the characters were in the main sympathetic - which was not an emotion I expected to feel. Susan Sarandon was also strong as she always is, and I thought Anthony Hopkins, looking so much younger, came across as trying to prevent further disaster for his country. I particularly enjoyed discovering the background to Il Duce's daughter and her husband as this was a part of the conflict I knew nothing about. It inspired me to find out more.