This is the most famous sight on Capri, where visitors from around the world form long queues to get a peek inside for just a few magical moments: we're talking about the Blue Grotto, of course. This natural cavern is 25 meters wide and 60 meters long, with a tiny entrance less than a meter high. To enter, visitors lay back in wooden rowboats and glide through the low cave mouth. Once inside, the boats bob in the dark, suspended on the surface of water so blue that it seems dream-like.