<p>Journey through the messy past and uncertain future of America’s national parks. The Washington Post’s Lillian Cunningham ventures off the marked trail to better understand the most urgent stories playing out in five iconic landscapes today.</p><p><br></p><p>“Field Trip” is a new podcast series that will transport you to five national parks: Yosemite, Everglades, Glacier, White Sands and Gates of the Arctic. Follow <a href="https://www.washingtonpost.com/podcasts/field-trip/?utm_source=podcasts&utm_medium=referral&utm_campaign=canary" rel="noopener noreferrer" target="_blank">the show</a> wherever you listen.</p>