There is free entry to around 30 state museums and monuments in and around Rome on 1 May.
The participating museums include Galleria Borghese, Galleria Corsina and Galleria Nazionale d'Arte Moderna (GNAM) while for those interested in a trip outside the capital, Villa D'Este and Villa Adriana in Tivoli are also on the list.
For full details see the Beni Culturali website.