Generate large, ancient sundial situated amidst the sea, surrounded by rocky formations under a cloudy sky. It exudes a surreal and mystical aura due to its grand scale and unusual location. The scene is reminiscent of a fantastical landscape, possibly inspired by historical or mythical narratives. The sundial itself, being a symbol of time, adds a timeless quality to the image, suggesting themes of eternity and the natural cycles of the world.