Archeological ruins on Tinetto Islet

This is an Italian island in the Gulf of La Spezia, in the E part of the Ligurian Sea. It's part of an archipelago of 3 closely spaced islands jutting out south from the mainland at Portovenere. In 1997, the archipelago, together with Portovenere and the Cinque Terre, was designated a UNESCO World Heritage Site.