The Cuevas del Drach, or Dragon Caves, are a series of impressive limestone caves located on the island of Mallorca, Spain. These caves are famous for their stunning rock formations, underground lakes, and unique geological features. The main attraction is the Lake Martel, one of the largest underground lakes in the world, which stretches over 100 meters. Visitors can explore the caves through guided tours that showcase the breathtaking stalactites and stalagmites. The tours often include a short classical music concert performed on boats floating on the lake, enhancing the magical atmosphere of this natural wonder.