Sant'Antioco is the main town on the island of the same name. Your walk will take you to the Basilica di Sant'Antioco Martire, which has interesting catacombs, the Museo Etnografico, established in an 18C house, the Villaggio Ipogeo and Tophet, the archaeological site of Ancient Sulcis, and the Museo Archeologica. Don't forget to climb to the top of Fort Sabaudo for the splendid panoramic view.