View of the Great Smoky Mountains National Park are seen in Tennessee. (Patrick Gorski/NurPhoto via Getty Images)(NEW YORK) — Park rangers in the Smoky Mountains are searching for a missing 21-year-old man who was last seen in Nashville four days ago, according to the National Park Service. Park officials are scanning the Big Creek area of the Great Smoky Mountains National Park in their search for Lakes, officials said. Park officials said “several organizations” are assisting the NPS with search efforts. The National Park Service did not immediately respond to ABC News’ request for comment.