Unique caves are located in the eastern part of the island: Bath of Diana, Theatre fairies, enchanted city. Underground route length of 1700 m extends the realm of magnificent stalactites and stalagmites through the halls with names like Waterfall, Black Lake, Grand Salon and the White Cave. Pearl of the underworld - the largest underground lake in Europe - Martel (177 m in length, 40 meters in width and depth - 5-8 m). It even hosts concerts, during which musicians, performing chamber music, slowly floating on the lake in boats highlighted.