 The coin board that measured coins in hundreds to thousands is unique.The coins issued by Tipu Sultan during his brief spell in Kerala, Indo-Dutch coins, Malabar coins (issued by the French), and coins of British India point to different periods of the history of Kerala.Serpent Grove or Sarpa Kavu is a snake shrine built for worship of serpent gods like "Naga Raja" (King of the snakes) and other snake deities, which is believed to bring prosperity to the royal family.