Legend has it this island was born after a fight between Poseidon and the giant, Polyvotis. Having angered the gods, Polyvotis fled across the Aegean with the sea god hot on his tail. As the story goes, Poseidon broke off a piece of Kos with his trident and threw it at Polyvotis, pinning him down. In doing so, Nisyros was created. The star sight on the island itself? An enormous volcanic crater.