This Scenic Railroad Through the Mountains Is One of the Best Leaf-Peeping Trips in the U.S.—and It Goes Through an Iconic National Park

All aboard the Great Smoky Mountains Railroad.<div class="media_block"><a href="https://www.travelandleisure.com/thmb/OuJTtSYABtDLk4OvI0d6JLUlJYc=/filters:no_upscale():max_bytes(150000):strip_icc():format(jpeg)/TAL-Train-and-Lake-GSMRAILROAD0323-0f9b1acb33c5407e8bd127367e3b4618.jpg"><img src="https://www.travelandleisure.com/thmb/OuJTtSYABtDLk4OvI0d6JLUlJYc=/filters:no_upscale():max_bytes(150000):strip_icc():format(jpeg)/TAL-Train-and-Lake-GSMRAILROAD0323-0f9b1acb33c5407e8bd127367e3b4618.jpg" class="media_thumbnail"></a></div>