Yosemite helped inspire the national parks. As wildfires threaten its giant sequoias, Lillian Cunningham asks, on the "Field Trip" podcast, what it will take to correct past mistakes and ensure the survival of these ancient trees. Listen to the podcast now -- a perfect companion to your Yosemite adventure.

Glacier National Park is home to the breathtaking Going-to-the-Sun Road. The park borders the Blackfeet reservation, where Native people push for a greater hand in managing national park lands. On the "Field Trip" podcast, Lillian Cunningham asks whether that could ever happen. Listen now as you head into the park.

Everglades National Park is a revealing place to slog through the marsh. What will it take to restore this unique landscape of water and sky? On the "Field Trip" podcast, Lillian Cunningham steps back in time to explore how past mistakes devastated the “River of Grass.” Along the way, the park’s wildlife has a thing or two to say. Listen now as you embark on an Everglades adventure.

In White Sands National Park, visitors can climb the dunes for a view of a park imprinted with ancient human history and the beginnings of the Atomic Age. On the "Field Trip" podcast, Lillian Cunningham tries to understand why America’s deserts have been both safeguarded and sacrificed. Listen to the podcast and explore the park.

At Gates of the Arctic, adventurous visitors can journey above the Arctic Circle to the most remote and least visited National Park. On the "Field Trip" podcast, Lillian Cunningham confronts the big question facing this park's future: whether a portion of this untouched wilderness will soon include a path for industry. So few travel to Gates of the Arctic, the podcast gives you a chance to join Lillian inside.