In the center of Virginia, Shenandoah National Park protects portions of the Blue Ridge Mountains, which range in height between 2,000 and 4,000 feet. Along their crest and running the length of the park is the Skyline Drive, the northern continuation of the Blue Ridge Parkway, with stopping points to enjoy the views and attractions, including President Hoover's summer residence and the old Cave Cemetery below Dark Hollow Falls. You can find information about hiking trails at the park entrances. Flowering trees and shrubs are at their finest in spring and summer, but the park is best known for its autumn colors in October. Only a short drive west from the Skyline Drive on US 211 are Luray Caverns containing magnificent formations of stalactites and stalagmites. One of the cave's highlights is the world's only stalactite organ, where the stalactites resonate when struck with rubber mallets.