Grotto Geyser always makes me think of a sea turtle. If you imagine the rounded feature in the middle as the turtle's head, then the other two rounded features on either side look like flippers. Grotto Geyser is in the Upper Geyser Basin, which includes Old Faithful Geyser, in Yellowstone National Park.
Grotto may actually be a unique example of natural arch formation. Scientists believe that the two "flippers" may have been formed by geyser mineral deposits over tree trunks which created two arches, since each flipper is an arc of rock over openings.
Remember, it's not just a picture, it's a story.