CaliforniaDestinationsHiking + Nature The Ultimate Guide to Mount Diablo by Karen Bakar August 28, 2019 As you drive along Route 680 in Contra Costa County, a solitary mountain dominates the horizon. ItĀ could almost be mistaken for a volcano. Sacred to the Miwok Indians who once lived here, … Continue Reading August 28, 2019 1 FacebookTwitterPinterestLinkedinEmail