Discover the caves of Alghero: Neptune’s Grotto, Green Grotto, underwater caves and Capo Caccia. A complete guide to help you plan your visit.

The Caves of Alghero: Complete Guide to the Wonders of Capo Caccia

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Caves of Alghero
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The Capo Caccia promontory is home to one of the most spectacular karst systems in Sardinia and throughout the Mediterranean. Over millions of years, water has carved an intricate network of cavities and underground formations, creating a natural heritage of extraordinary value.

From caves open to visitors and submerged caverns to sites of archaeological interest, the caves of Alghero offer very different experiences. You can join a guided tour of the famous Neptune’s Grotto or explore spectacular underwater caves during scuba diving excursions.

In this guide, you will find an overview of the main caves around Alghero, together with links to more detailed guides, so you can choose the experience that best suits your interests.

Neptune’s Grotto

Neptune’s Grotto is undoubtedly the most famous cave in Alghero and one of the most visited natural attractions in Sardinia. Located at the foot of the Capo Caccia promontory, it features spectacular chambers filled with stalactites and stalagmites, the impressive Lake La Marmora and some of the most remarkable limestone formations in the Mediterranean.

The cave can only be visited with a guide, allowing visitors to discover an underground environment shaped by nature over millions of years.

Find out more:

Green Grotto

Less well known than Neptune’s Grotto but equally fascinating, Green Grotto is one of the most important archaeological sites along the Alghero coast. Graffiti and evidence of human presence dating back to the Neolithic period have been discovered inside, making it one of the few caves in Sardinia where natural and historical interest come together.

Today, the cave can be visited as part of organised excursions and is an ideal destination for anyone looking to discover a less touristy side of the Capo Caccia promontory.

Find out more about visiting Green Grotto.

The underwater caves of Capo Caccia

Below sea level lies a completely different world, made up of tunnels, passages and large submerged chambers that make Capo Caccia one of the most fascinating destinations for scuba divers.

Among the most famous dives is the Cave of Nereo, considered one of the largest underwater sea caves in Europe, together with other routes that attract diving enthusiasts from around the world every year.

Discover the main underwater caves of Alghero.

Capo Caccia: the promontory of caves

Capo Caccia is much more than the location of Neptune’s Grotto. Its dramatic cliffs rising directly from the sea, rich biodiversity and network of natural cavities make it one of the most iconic landscapes in north-western Sardinia.

Visiting Capo Caccia means entering an environment where nature, geology and history come together in a truly remarkable setting.

The Escala del Cabirol

One of the symbols of Capo Caccia is the Escala del Cabirol, the spectacular staircase of 654 steps connecting the promontory with the entrance to Neptune’s Grotto.

Walking down the staircase offers one of the most impressive views along the Alghero coast, with the crystal-clear sea and the towering limestone cliffs of the promontory stretching out before you.

Which cave should you visit in Alghero?

The best choice depends on the type of experience you are looking for.

  • Neptune’s Grotto: ideal for a guided tour through spectacular limestone formations and underground lakes.
  • Green Grotto: perfect for anyone interested in history, archaeology and nature.
  • Underwater caves: for certified divers who want to explore the submerged world of Capo Caccia.
  • Capo Caccia and the Escala del Cabirol: not to be missed if you enjoy panoramic views and outdoor excursions.

Frequently asked questions

What is the most famous cave in Alghero?
Neptune’s Grotto is the best known and is one of Sardinia’s main natural attractions.
Which caves can be visited?
The main caves open to visitors are Neptune’s Grotto and Green Grotto. The underwater caves can only be explored as part of organised scuba diving excursions.
Where are the caves of Alghero located?
Most of the caves are concentrated around the Capo Caccia promontory, within the Capo Caccia – Isola Piana Marine Protected Area.
What is the best time to visit them?
Spring and early autumn offer pleasant temperatures and generally fewer visitors, although Neptune’s Grotto can be visited for much of the year.

Where to stay when visiting the caves of Alghero

Staying in Alghero makes it easy to reach Capo Caccia and the main attractions of the Riviera del Corallo.

From B&B Bonsai Alghero, you can organise excursions, cave visits and itineraries to discover the surrounding area, while also getting useful advice on choosing the experience that best suits your needs.

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This page on accessibility was last updated on June 25, 2025.