Phra Nang Cave, on the east side of Railay, is famous for its wonderful stalactites and stalagmites. Since ancient times, Phra Nang Cave or Princess Cave is where fishermen make offerings to the symbolic Phallus of Shiva Siwaleung or Palad Khik in Thai. Fishermen say the cave is home to a mythical sea princess. They believe offerings will help them reap fish and protect them from danger. The cave contains a remarkable collection of carved phallic fertility symbols.