Neptune's Grotto
Discovered in the 18th century, this karst cave features a subterranean saltwater lake and a 654-step cliff stairway.
4 places covered in Alghero
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Grotta dei Cervi
Alghero's submerged cave with the bones of the Sardinian dwarf deer.
Grotta dei Fantasmi
Punta Giglio's submerged cave, cut by fresh water before the sea arrived.
Grotta di Nereo
The Mediterranean's largest submerged cave, beneath capo Caccia.
Tours, tickets and experiences
Bookable on GetYourGuideExperiences in Alghero
Near Alghero
The closest destinations covered by our editors, with straight-line distance.
