Diablo Sunset The Spanish named the East Bay's most visible mountain, "Monte del Diablo" or "Thicket of the Devil." Learn more about Mount Diablo. Mystic Mountain The Miwok and Costanoan tribes believed that Mount Diablo is where the basis of life was created. Learn more about the Miwok people. Snow Capped Diablo About one mile from the top, the Mountain House Hotel entertained guests from 1874 to 1895. Learn more about the Mountain House Hotel. Mount Diablo Mount Diablo's summit is at 3,849 feet. View Mount Diablo park map. Copyright © 2000-2004 Keith Bordonaro webmaster@bayareaphotos.com