Casa Museo houses an archaeological collection dating back to the Punic Age (6^th-4^th centuries BC) and the Roman Age (3^rd century BC - 4^th century AC), retrieved from the area of the ancient city of Bithia. In Punic and Roman times, Bithia was one of the most important cities in Sardinia and was connected with the cities of Karales (Cagliari) and Nora via a coastal road, which is still walkable.

In 1926, in the nearby beach of 'Sa Colonia', a strong sea storm brought to light a necropolis with tombs excavated in the sand and grave goods. Not only that: in 1930, just below the tower of Chia, archaeologist Antonio Taramelli brought to light a large sandstone statue depicting the god Bes, a deity of Egyptian origin who protected women in labour and families, indicating that there was a temple and shrine dedicated to him nearby.

The museum also exhibits vases and amphorae made in the 1800s, then moves on to the Roman period with terracotta objects such as plates, cups, vases, amphorae, jugs, oil lamps and anatomical votive offerings. Objects for everyday use such as jugs, amphorae and plates from the Punic period are also on display, as well as funerary equipment consisting of oil lamps, amulets and balsam jars.