Visitors can get in for free at more than 400 national parks for Founders Day
On Aug. 25, visitors heading to one of more than 400 national parks around the country can get in for free in honor of the National Park Service's 103rd birthday.
On Aug. 25, visitors heading to one of more than 400 national parks around the country can get in for free in honor of the National Park Service's 103rd birthday.