Neptune's Grotto (Grotta di Nettuno)
Sea cave at Capo Caccia, west of Alghero. Boats from Alghero harbour sail to the entrance; by road, visitors walk down the Escala del Cabirol, 654 steps from Piazzale di Capo Caccia, and land visits must be booked. Entry is EUR 18 per adult and EUR 10 for ages 6 to 17 and students up to 26; under-6s go free. Boat fares are separate from grotto entry.
Nuraghe di Palmavera
Nuraghe site beside the SS127bis road west of town, towards Porto Conte, an 11-12 km drive of about 25 minutes. Admission is EUR 7 per adult and EUR 5 for ages 6 to 17 and students up to 26; children under 6 and visitors with disabilities go free.
Cattedrale di Santa Maria
Alghero's cathedral, in the old town a mostly flat walk of under 1 km from the harbour. The Diocesan Museum of Sacred Art ticket, which includes the bell tower, costs EUR 6 per person; children under 6 go free.
Alghero old town
Alghero's historic centre is beside the harbour where tenders land, and its streets are free to explore.