Take the long seaside staircase escala del cabirol, or “goat steps,” down to this incredible natural wonder near Alghero. The grotto takes its name from Neptune, the Roman god of the sea. Inside you’ll find a large saltwater lake and both stalactites and stalagmites that create an otherworldly experience. If you don’t fancy climbing down (and up) the 656 steps, and if the water is calm, you can take a boat from the harbour in the Port of Alghero. Settle in for the night at this farm cottage a short drive from the grotto, in a peaceful corner of Alghero surrounded by farmland and vineyards. Perfect for couples, the one-bedroom cottage features a spacious terrace equipped with sunchairs and a hammock for an evening of relaxation.