In its near-century of existence, Chateau Marmont — a faux French castle perched on a hill near the entrance of West Hollywood’s Sunset Strip — has kept countless secrets for the artists, actors and other icons that have stalked its halls. It has also held a few mysteries of its own, including a long-rumored secret tunnel. In its near-century of existence, Chateau Marmont — a faux French castle perched on a hill near the entrance of West Hollywood’s Sunset Strip — has kept countless secrets for the artists, actors and other icons that have stalked its halls. It has also...