Devil's Slide Bunker by Rex Boggs (California Photo Spot)

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Devils Slide Bunker - Photo by Rex Boggs

Devil’s Slide was the location of a military triangulation station and observation site used during World War II as part of the harbour defence of San Francisco. Prior to the advent of radar, military personnel used binoculars and compasses to search for ships at sea and relay their coordinates to a central post. (Pacifica, California, USA)