Grotte di Nettuno (Neptune's Grotto)
Carved into the base of the Capo Caccia headland by millions of years of seawater, Neptune's Grotto is a cathedral of stalactites and stalagmites that stops every visitor dead in their tracks. Getting there is half the drama — and the reward is one of the Mediterranean's most jaw-dropping natural spectacles.
Two epic ways to arrive
The classic approach is the Escala del Cabirol — 654 steps chiselled into the cliff face, with the turquoise Gulf of Alghero spread out below you on every switchback. The name means 'roe deer staircase', and the sure-footedness it demands is well earned.
Prefer to arrive by sea? Navisarda runs boat excursions from Alghero's tourist port, hugging the Capo Caccia coastline for a 40-minute crossing that reveals sea arches and sheer limestone walls you simply cannot see from land. The boat service runs April to November.
Inside the grotto
Every guided tour (30–40 minutes) threads through a sequence of chambers where formations tower up to 20 metres and a still underground lake reflects the whole scene in mirror silence. The air is cool and damp even in August — bring a light layer.
Photography without flash is permitted, and the guide's torch-lit reveals of each new chamber feel genuinely theatrical. Book your time slot online in advance during July and August, as entry is at fixed times and queues build fast.
Grotte di Nettuno (Neptune's Grotto) on video
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