Inner Space Caverns was discovered in 1963 by a construction crew drilling I-35. As they were drilling the bit broke and fell into the caverns. Curious, a crew member was lowered down the hole into the caverns. They named it Inner Space because it was during the height of America's obsession with outer space and the caverns were seen as the inverse of outer space.
This one resembles a sumo wrestler eating a large ice cream cone.