Once very beautiful and lived far in the north were the sun didn't visit. Being very curious, she wanted to see the sun, and asked the Goddess Athena for permission to visit the south. Athena refused to allow her to visit. Medusa got angry and dared to say that Athena hadn't given her permission because she was jealous of her beauty. Athena was so angered, she punished her by turning her hair into snakes and cursing her by making her so ugly that who ever lookes at her eyes would turn into stone. As you can see, she's still beautiful if you can survive her gaze.