The National Archaeological Museum of Cosa, built above the perimeter structures of a Roman domus, exhibits the most significant finds from the excavations of the city and its territory. Visitors can admire the terracotta decorations of the temples on the Arx, a selection of numerous domestic artifacts found in the settlement (ceramics, lamps, glassware, ivory, and metals), fragments of painted plaster from the domus, and various sculptural and epigraphic finds from the city's public buildings.