The Blue Caves are located in the northern part of the island and is one of the most famous sights. The unusual caves were discovered in 1897 and the largest is called Blue Grotto.
To visit them must hire a boat or symetaschete one of the tours organized by travel agencies. The closest point from where you can catch a boat is the port of Agios Nikolaos near Volimes but boats run and many other places.
The colors in the caves are impressive and have to see it to believe it. The sea area near the caves are ideal for snorkeling.