Alghero
Spectacular Views in Sardinia picture - Grotta di Nettuno Neptunes Grotto is a remarkable series of caves just outside Alghero, which can be seen on a 45-minute tour. Boats leave from the marina, and the hour-long journey takes in the dramatic coastline surrounding the limestone headland, Capo Caccia. You can also catch a bus to Capo Caccia and climb down the 654 steps to reach the caves below.