There is never a shortage of beautiful art in Rome. Here is a list of the current exhibits, as shown on lifeinitaly.com:
Capitoline Museum: The Age of Conquest: The Lure of Greek Art in Rome; masterpieces looted from Greece between the third and first centuries BC; until September 5.
Scuderie del Quirinale: Caravaggio; 24 masterpieces from Italy and abroad including Musicians from the Met, Lute Player from the Hermitage, and many others; until June 13.
Fondazione Roma Museo: Edward Hopper, 170 works mostly from New York's Whitney Museum including The Sheridan Theatre, New York Interior; until June 13.
Vittoriano: From Corot to Manet, The Symphony of Nature; 170 impressionist works including Corbet, Boudin, Pissaro, Sisley; until June 29.
Chiostro del Diamante: Boldini, De Nittis, Zandomenighi, other Italian painters in Paris; until March 14.