Neptune’s Grotto extends for about 4 km, but for safety reasons only part of it is open to the public. Speleological explorations have revealed many secrets, while other sections remain accessible only to experts. The tourist path still offers a chance to admire underground lakes, large halls, and extraordinary limestone formations.
History and Origins
The cave was formed about 2 million years ago. Archaeological findings in nearby caves show that prehistoric people were familiar with this area. Its modern “rediscovery” is attributed to a fisherman from Alghero, although it is believed that even the Romans may have known the caves, as suggested by finds in the nearby Grotta Verde.
The Fascination of Neptune’s Grotto
The 40-minute guided tour takes visitors through extraordinary natural settings:
- Lake La Marmora – a vast underground saltwater lake with the Pebble Beach;
- Hall of the Royal Palace – with majestic stalagmites and the Christmas Tree formation;
- The Great Organ – the largest calcitic column in the cave;
- Hall of Laces – with delicate formations resembling lace and embroidery;
- Music Balcony – once used for concerts and performances inside the cave.
Natural light filtering from outside creates blue reflections on the walls, enhancing the beauty of the stalactites and stalagmites. A breathtaking experience that must be preserved carefully.
Reaching Neptune’s Grotto on Foot: Escala del Cabirol
The Escala del Cabirol (literally “Roe Deer Staircase”) has 654 steps carved into the cliff of Capo Caccia. Built in 1954 by architect Antoni Simon Mossa, it is a challenging yet spectacular path offering stunning sea views at every turn.
Practical Info
- Descent/Ascent time: approx. 30 min down; 45–60 min up, depending on fitness.
- Difficulty: demanding in summer due to sun exposure.
- Tips: wear comfortable shoes, bring water and a hat, and plan your visit in the cooler hours of the day.
How to Get There by Car and Shuttle
The best starting point is the free parking at Mugoni Beach (SP55 road). From there, a shuttle service runs to Capo Caccia:
- Shuttle: daily from 8:00 am to 8:00 pm, every hour;
- Price: €5 round trip (free for children 0–3 years); tickets available on board;
- Important: parking along the last stretch of SP55 is prohibited; only drop-off and pick-up are allowed.
Visiting Neptune’s Grotto by Boat
Boat access is available from April to October (weather permitting). Tours depart from Alghero’s harbor, with a journey of about 40 minutes.
What You See Along the Coast
The boat ride offers wonderful views of the Coral Riviera and Capo Caccia’s cliffs: Capo Giglio with WWII remains, unique sea caves, and the high cliffs of Capo Galera with hidden coves.
Costs and Details
- Navigation time: ~40 minutes each way.
- Boat ticket: about €15 adults, €7 children (varies by operator; entrance ticket not included).
- Cave entrance: tickets purchased on site (approx. €18 adults, reduced fares for children).
- Best period: April–October, only in calm sea conditions.
The boat trip is easier and includes unique coastal views, but tours may be cancelled in case of rough seas.
Opening Hours, Duration and Tickets
- Opening hours: April – November: 9:00 am – 7:00 pm (last entry). November – March: 10:00 am – 3:00 pm.
- Guided tour duration: about 40 minutes.
- Tickets: available on site; boat trips must be booked with operators at Alghero’s harbor.
Curiosities
Stalactites and stalagmites in the cave take centuries to form: about 300 years are needed for just 1 cm. Some areas are inactive, while others are still “alive,” with dripping water feeding their growth. Visitors can often spot the newer, lighter-colored sections.
The cave was even used as a film set in 1978 for Island of the Fishmen, when a small boat was built inside the cave for the movie. Today, thousands of tourists visit each year, with regulated access to protect its fragile formations.
Before visiting, it is advisable to check official guidelines on clothing, restrictions, and safety rules.
Discover Neptune’s Grotto with a Stay in Alghero
Whether you choose the dramatic Escala del Cabirol or the scenic boat trip, Neptune’s Grotto offers unforgettable moments between nature and history.
Stay at B&B Bonsai Alghero, the ideal base to explore Capo Caccia, the Coral Riviera, and northwestern Sardinia.
Book your stay at B&B Bonsai and ask us for tips on tours, shuttles, and boat operators.