The National Park Service turns 100 this year, and to celebrate, the NPS is waiving entry fees to its national parks all of next week, Time reports. National Park Week runs April 16 through April 24, thanks to a joint effort by the NPS and National Park Foundation. "We want people everywhere to embrace the opportunities to explore, learn, be inspired, or simply have fun in their 407 national parks, as well as understand how the National Park Service's community-based recreation, conservation, and historic preservation programs positively impact their own communities," reads the NPS website.
As part of the anniversary celebration, the NPS has also launched a "Find Your Park" campaign that helps people track down commemorative events and share their own experiences at local parks. A complete list of parks offering free admission can be found here. Time also notes other free days through the end of the year if you can't make it next week. (A recent post offered what sounded like a dream job with the NPS.)