Basic Park Information Protect Our Parks Saving the Hemlock Trees in Great Smoky Mountains National Park A hemlock tree on the Alum Cave Trail in Great Smoky Mountains National Park A hemlock tree on the Alum Cave Trail in the national park. Share this Facebook Icon Twitter Icon Email Icon Join Great Smoky National Park Trips Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Great Smoky National Park Trips Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Photo: NPS/Great Smoky Mountain National Park