In honor of our US National Park’s 100th birthday later this month, here are some shots of Stu Patterfoot visiting Wind Cave National Park in the southern Black Hills of South Dakota. This was the first cave in the world to be named a national park. (Thank you, Teddy Roosevelt.) The park is nearly 34,000 acres on the surface with plenty of wildlife, but below ground it includes one of the world’s largest cave system. It is famous for the calcite boxwork formation which is quite rare and stunning.

Visit our national parks this month.

P.S. Towards the end of August, all national parks will be free for four days!!!!