1. Green Grotto, also known as Grotta Verde, is a sea cave located on the picturesque island of Capri, off the coast of Italy. The cave gets its name from the stunning emerald green hue of the water inside, which is attributed to the reflection of sunlight passing through the underwater opening.

The cave is about 30 meters long and features a small pebble beach inside. Visitors can explore the cave by boat or kayak, and marvel at the unique natural beauty of the crystal-clear water and the play of light on the cave walls.

2. The Green Grotto is open to visitors from April to October, with varying opening and closing times depending on the season. It is advisable to check the official website or contact the tourism office of Capri for the most up-to-date information.

Unfortunately, exact contact information such as phone number is not readily available.

3. To visit the Green Grotto, visitors typically need to take a boat or kayak tour. The cost of these tours can vary depending on the provider and the duration of the tour. It is recommended to book a tour in advance, either through a local tour agency or at the Marina Grande port in Capri.

Transportation to Capri can be accessed via ferries or hydrofoils from various ports in Italy, such as Naples, Sorrento, and Amalfi. Once on the island, visitors can reach the Green Grotto by taking a boat from Marina Grande or Marina Piccola ports.