There is free entry to Rome's civic museums on the occasion of "Natale di Roma", or Rome's birthday, on Sunday 21 April.
There are a number of exceptions however: the normal ticket fee applies at the Planetarium, while visitors to the Ara Pacis and Capitoline Museums pay a ticket for the exhibitions only.
The exhibition of 18th and 19th-century English landscape painters opens on 21 April at Palazzo Braschi and runs until 15 September.
The following is the list of institutions that are free on 21 April:
Centrale Montemartini
Mercati di Traiano – Museo del Foro Traiano
Museo Napoleonico
Museo di Roma Palazzo Braschi
Museo di Roma in Trastevere
Museo Barracco
Museo della Civiltà Romana
Museo delle Mura
MACRO Museo Arte Contemporanea Roma
Museo Carlo Bilotti – Arancera di Villa Borghese
Museo Pietro Canonica
Musei di Villa Torlonia
Museo Civico di Zoologia
Museo della Repubblica Romana e della memoria garibaldina
Galleria d’Arte Moderna di Roma Capitale (Via Crispi)
MACRO Testaccio
Villa di Massenzio
For a comprehensive list of events in Rome on 21 April see our What's On section.