Considering the La Scalinatella in Capri?
A VT member wrote the following comment about visiting Capri:
A magic blue light by tauroctonia
Some people come to Capri just to see the grotto azzurro, the blue grotto. It's a short pleasure, that's for sure. You have to pay about 8 euros to enter one of the boats. The boat gets into the grotto and takes a short tour around taking about 5 minutes. It's necessary that the sun is shining to really appreciate the deep azur of the sea that is reflected on the stone walls. A special natural phenomenon - it's worth it!