A must
Rome is already famous for art but one museum which really stands out is the Galleria Borghese in the gardens of the Villa Borghese. In other words, it's a must.
The Galleria is located in the Villa Borghese, named after the family to which it once belonged, and houses the Borgheses’ painting, sculpture, and antiques collection. The collection was started by Scipione Borghese (1576-1633), nephew of Pope Paul V.