natgeofound: A man balances a piece of pumice rock on his legs in Katmai National Park and Preserve, Alaska, September 1921.Photograph by Lucius G. Folsom, National Geographic
natgeofound: A man balances a piece of pumice rock on his legs in Katmai National Park and Preserve, Alaska, September 1921.Photograph by Lucius G. Folsom, National Geographic
