The Galleria Comunale d'Arte sits in the Giardini Pubblici above central Cagliari, which already makes the visit feel calmer than the streets below Castello. Inside, the municipal collection focuses on Sardinian and Italian art, with 20th-century works that help round out a city often seen mainly through archaeology and sea views.
It is a good indoor stop when the heat is heavy or when you want Cagliari beyond its Roman amphitheatre and cathedral quarter. Leave time for the gardens outside; the setting is part of the appeal.