All state museums will be free this week end in Rome :-). Saturday 25 and Sunday 26 are the European Heritage Days, the yearly initiative which sees citizens in 50 countries celebrate Europe’s cultural heritage with new cultural assets on view and the opening up of historical buildings normally closed to the public. A list of museums and monuments in Rome and surrounding can be found here: http://www.beniculturali.it/mibac/opencms/MiBAC/sito-MiBAC/MenuPrincipale/LuoghiDellaCultura/Musei-in-evidenza/index.html?pagename=&id=557&special=&categoriaComunicato=&mycategory=&tipologia=&hid_mese=&luogo=Lazio%7CRM%7CRoma&cmdconferma=Ricerca
On September 26 also the Vatican Museums will be free, as every last Sunday of the month. Enjoy the view!