On Christmas Eve in 1914, famed naturalist John Muir lay in a Los Angeles hospital bed, taking his last few breaths. A prolific nature writer and passionate preservationist, the 74-year-old spent his final moments racked with pneumonia, hundreds of miles from the 17-room Martinez Edwardian mansion he called home. A century later, Muir’s former residence — now the John Muir National Historic Site — is where national park staffers and about 30 Muir enthusiasts gathered on a gray Christmas Eve morning to mark the passing of the man who co-founded the Sierra Club and preserved Yosemite and other natural park...