These are the main archaeological museums in the area.

in Sassari
National Museum "Giovanni Antonio Sanna"

in Porto Torres (40km from Osilo)
open from Tuesday to Saturday
Antiquarium Turritano and Archaeological Area

in Castelsardo ( 40km from Osilo)
Museo dell'Intreccio Mediterraneo
http://www.mimcastelsardo.it/en/

in Alghero (50 km from Osilo)
Nuraghe Palmavera

in Torralba (59 km from Osilo)
Nuraghe Santu Antine