Board a boat from Alghero to the dramatic limestone cliffs of Capo Caccia, then descend into Neptune's Grotto — a vast sea cave cathedral of stalactites and underground lagoons that has awed visitors since Roman times.
What to expect
The 45-minute boat crossing from Alghero's Banchina dei Mille hugs the rugged northwestern coastline, passing sea-carved arches and nesting griffon vultures. Inside, a guided walkway winds for 2.5 km through chambers of extraordinary formations, their reflections shimmering in the underground lake. The temperature drops to a refreshing 14°C — a welcome respite in summer. Boats depart regularly, giving you full flexibility to time your visit.
Good to know
Boats depart from Alghero's port (Banchina dei Mille); Alghero is the nearest cruise port. Pre-book grotto entry online to avoid queuing. The cave can be closed in rough seas — check conditions the morning of. Combine with a Catalan-quarter aperitivo in Alghero before returning to port.
Sail there
Luxury cruises that call at Sardinia — book through us, the fare is identical and your concierge stays on your side.
More to do in Sardinia
- La Maddalena Archipelago: Private Boat to Emerald Lagoons
- Cala Goloritzè: Hike to Sardinia's Most Iconic Sea-Stack Beach
- Nuraghi & Nuragic Sardinia: Private Archaeological Masterclass
- Sardinian Food & Wine Immersion: Private Market-to-Table Experience
- Costa Smeralda by Private Minivan: Porto Cervo & Hidden Coves