Get ready to explore two parks in one. On the surface, you'll find yourself in a classic Black Hills landscape, a rolling prairie that's home to massive bison herds, pronghorn, and entire towns of prairie dogs. Then, descend below the plains on a guided tour to witness what makes this place famous: one of the world's most complex caves, decorated with incredibly rare, honeycomb-like formations called boxwork. It's a truly unique journey from the open plains to the intricate world below.