Summer Begins! 5 Ways to Enjoy Free National Parks

TheGiantVermin, flickr

Tuesday is not only the longest day of the year, the solstice, and the official start of summer, but also on of the few days a year that the National Park Service decides to open its doors. One hundred parks across the country will not charge entry fees, so it's the perfect time to take that overdue hike. We took it upon ourselves to find five fantastic free adventures.