The Blue Grotto

We'll be staying in Sorrento for several nights and visiting the Island of Capri while we're there. I'd really like to see the "Blue Grotto". This is what the outside of it looks like but you can go inside the caves there and at the right time of day, the sunshine reflects on the water and the cave walls and has an amazing blue color like what you see below. I've heard it's gotten more and more touristry, so we may not visit it, but if possible I would love to see this in person.