If you've been looking for an excuse to visit one of America's National Parks, start packing! The National Park Service is celebrating its 97th birthday on August 25th and you're invited. The party favor is free admission at every single national park. Visit the National Park Service's official birthday page to find out about special events taking place across the park system. Get inside one of these parks (for free) and you'll agree, the NPS is looking good for 97!