Wind Cave Beanie Pattern | NancyBatesDesigns。Hand Knit Pattern @nancybatesdesigns New, Never Worn Average Adult Size, 19”- 22” Circumference Unisex Style 100% Merino Wool, Faux Leather Tag Hand Wash, Shape To Air Dry South Dakota Jewel ✨ This biodiverse park in the prairies of South Dakota is home to forests, grasslands, wildflowers, bison, prairie dogs, and elk. Beneath all this beauty lies one of the longest and most complex caves in the world, Wind Cave. Its name comes from the wind that blows from a small natural entrance to the cave, but its most famous feature is boxwork, the intricate and rare calcite formation found throughout the cave.