8 Gorgeous National Parks You've Never Heard Of

The U.S. National Park Service turns 99 on Tuesday, and to mark the occasion all 408 national parks have free admission for the day. We took a look back at our archives and found these photos of little-known parks. The National Park Service protects far more than icons the Grand Canyon and Yosemite, and these parks are a testament to the agency's diversity and the breadth of what many call "America's best idea.