A group of researchers got the plum job of wandering the back trails of Yellowstone National Park taking photos.
They're lugging around 70-year-old camera equipment to the park’s highest points to take photos from the same vantage points as did Leonard M. Moe, who took dozens of panoramic photos in the park in the 1930s, according to the AP.
Moe’s photos were marked with peaks and other landmarks and kept in fire towers to help rangers be able to describe where a fire had broken out. Over time, however, the photos became less useful as landscape changed.
The researchers hope to document exactly how the park has changed by taking the same photos Moe took and comparing the images after 72 years of fires, bark beetle infestations, climate change and other factors. It's a joint project of the Park Service and U.S. Forest Service.
Some photo spots are accessible by helicopter or road. But most required hiking up steep slopes with 75 pounds of equipment.