“On the occasion of the International Women's Day, March 8, 2025, the Ministry of Culture offers free admission for all women to state museums, archaeological parks, monumental complexes, castles, villas and historic gardens and other cultural sites. This is a special initiative to celebrate and reflect on the cultural importance of this anniversary, with a rich program of events and guided tours throughout the country.”
just to note that Vatican City is not part of Rome and not covered by this.
Rome's civic museums (these are different than state museums) are also free March 8.
https://www.wantedinrome.com/news/rome-celebrates-international-womenc292s-day.html