Luray Caverns – Eastern America’s largest and most popular caverns. A U.S. Natural Landmark featuring the world’s only Stalacpipe Organ.  Enjoy step-free entrance and tours on all-paved walkways through cathedral-sized rooms with ceilings 10-stories high, towering stone formations, and natural wonders at every turn. Just 10 minutes from Skyline Drive and Shenandoah National Park and 15 minutes from I-81. (540) 743-6551.