Wind Cave National Park in South Dakota covers 28,000 acres of prairies and forests and includes the Southeast edge of Black Hills. However, the park is even more magnificent underground, concealing one of the longest caves in the world, stretching over 150 miles, with geologists believing that there is much more to be discovered. The Wind Cave National Park gets its name from the breeze coming out from a natural opening in the cave due to different pressure inside and outside. Apart from tours of the caves, the park offers multiple scenic trails in the surrounding landscape. The park is also renowned for wildlife spotting including bison, pronghorn, elk, deer, mule, and prairie dogs.