The Sand Cave Trail, just off Kentucky 255 near the park's entrance, is a short walk to the Sand Cave entrance where unsuccessful efforts to rescue trapped caver Floyd Collins in 1925 captured worldwide attention. Off of the South Entrance Road (Kentucky 70), Sloane's Crossing Nature Trail circles Sloan's Crossing Pond atop a sandstone ridge. The Turnhole Bend Nature Trail takes you to the Turnhole Bend Blue Hole, the park's largest spring at over fifty feet deep. Cedar Sink Trail rambles among various sink holes, giving you a close look at the early stages of the same geological processes that ultimately resulted in the Mammoth Cave we know today.