While a lot of people spend time IN Chapada Diamantina National Park, not everyone spends time UNDER it. Numerous cave systems were created by the rivers that run through the area. This particular cave, Gruta de Lapão, consists of sandstone and quartzite and is about a half a mile from end to end. Gold and diamonds were once found in many of these caves, but alas, I found none. Having hiked trails in the morning, jumped off waterfalls in the afternoon, and taken in the panoramic view from Pai Inacio Hill, finishing the day in the bowels of the park was a fitting end to an adventurous day.