Wind Cave National Park, Black Hills, South Dakota (© Blaine Harrington III/Corbis)

Wind Cave National Park, Black Hills, South Dakota (© Blaine Harrington III/Corbis)

comments,

• We assure you, this alien environment is wholly terrestrial.""It\s celebrating 111 years as a national park today
• Local Native American tribes knew of this cave because of the strange winds that blew near the entrance.""Eventually, some curious settlers took a chance and climbed inside
• On the grass-covered prairie above this scene...""Lives a uniquely North American beast
• Okay, so you can\t see the caves on a map, but you can see how many other state and national parks...""Lie in this mountain range in the Great Plains