Today on “Post Reports,” we join The Post’s Lillian Cunningham on her journey through the messy past and uncertain future of America’s most awe-inspiring places: the national parks. First stop? Yosemite.

Field Trip: Glacier National Park

Post Reports is the daily podcast from The Washington Post. Unparalleled reporting. Expert insight. Clear analysis. Everything you’ve come to expect from the newsroom of The Post, for your ears. Martine Powers and Elahe Izadi are your hosts, asking the questions you didn’t know you wanted answered. Published weekdays around 5 p.m. Eastern time.