Starting in the 1870s, people with dollar signs in their eyes started selling Mount Diablo to investors and tourists. First was Joseph Seavey Hall, who built a hotel and two toll roads. Then came Robert Noble Burgess, who planned to build a castle on top with William Randolph Hearst. Then along came World War I . . .

Part 3 of "A Brief History of Mount Diablo State Park," presented by Mount Diablo Interpretive Association in partnership with Save Mount Diablo and Mount Diablo State Park.