Unique cave located in the Eastern part of the island: Diana's bath, the Theatre of the fairies, the Enchanted city. Underground route length of 1700 m passes through the Kingdom of great stalactites and stalagmites through the halls with names such as Falls, Black lake, a Large lounge and the White cave. The jewel of the underworld — the largest underground lake in Europe — Martel (177 m long, 40 m wide and depth of 5-8 m). Here, even concerts, during which the musicians performing chamber music, slowly float illuminated by the lake in boats.