32 Underrated National Parks Perfect for Avoiding Summer Crowds

16. Wind Cave National Park, South Dakota: Subterranean Secrets & Prairie Serenity

Below the surface, Wind Cave National Park hides one of the world's longest and most complex caves, famous for its rare boxwork formations. Above ground, vast mixed-grass prairie is home to bison, elk, and prairie dogs, offering a serene wildlife viewing experience. Unlike more crowded Black Hills attractions, Wind Cave provides quiet trails through rolling hills and peaceful opportunities for wildlife photography. It's a dual-experience park where subterranean wonders meet sweeping natural quiet.