An intrepid group learns to cook with only the heat from a hot spring, Yellowstone National Park, 1924.

National Park Service Historical Photograph Collection/Photographer Cribbs

A surprise guest stops in to listen to the radio, Yosemite National Park, 1920.

National Park Service Historical Photograph Collection/Photographer James V. Lloyd

A woman shows off her impressive collection of national park stickers, Yellowstone National Park, 1922.

National Park Service Historical Photograph Collection

A buck begs for snacks at a car—the start of an unfortunate trend, Yellowstone National Park, 1926.

National Park Service Historical Photograph Collection

The park rangers motorcycle patrol looks more like a gang of Hells Angels, Yellowstone National Park, 1919.

National Park Service Historical Photograph Collection

Even feathered friends can’t pass up the opportunity for a picnic, Bryce Canyon National Park, 1954.

National Park Service Historical Photograph Collection/Photographer Arthur F. Fawcett

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