Grab a friend and head to Skyline Caverns, conveniently located at the Northern Entrance to Skyline Drive and the Shenandoah National Park. Skyline Caverns is one of only a few places in the world where you will find unique formations known as Anthodites. Called "Orchids of the Mineral Kingdom", the Anthodites seem to defy gravity. Their delicate white spikes spread in all directions, including upwards, from their position on the cave ceiling. Their growth rate is estimated to be only one inch every seven thousand years!