The Athens Municipal Art Gallery gives modern Greek art a civic home away from the archaeological headline sights. Housed in the old silk factory area of Metaxourgeio, it usually combines works from the city collection with temporary exhibitions that show a more recent, urban Athens.
It is a useful stop if you are already exploring the neighbourhoods west of Omonia or want a museum that is not built around antiquity. The surrounding streets are mixed and changing, so visit during the day and fold it into a broader walk rather than treating it as a stand-alone pilgrimage.