Ásbyrgi Canyon, Jökulsárgljúfur National Park, Finland. Nicknamed Sleipnir's footprint, it is said that the canyon was formed when Odin's eight-legged horse, Sleipnir, touched one of its feet to the ground here. Legend also relates that the canyon is the capital city of the "hidden people" (huldufólk), who live in cracks within the surrounding cliffs.