Grotta Azzurra, or the Blue Grotto, is a famous sea cave located on the coast of Capri, Italy. It is renowned for its stunning blue waters, which are illuminated by sunlight filtering through an underwater opening. Visitors can take small boats to enter the cave and experience its enchanting colors. The cave is approximately 60 meters long and 25 meters wide, with a height of about 15 meters. The best time to visit is during midday when the sunlight creates the most vibrant blue effect. Grotta Azzurra has been a popular tourist attraction since the 19th century, drawing visitors from around the world.