Marin Headlands was a military base until the late 1960s. It was the counterpart to the Presidio, designed to protect San Francisco Bay from invasion. The military constructed five installations among the rolling hills. Each one was obsolete upon or before completion. Bunkers and batteries, underground concrete buildings, are ghostly remnants of a time past. Skeletal steel arms reach out from hillsides. Monterey pines and cypress, accidentally planted by seeds caught in truck tires on loan from the Monterey bases, mark the spot where bunkers and batteries lie.

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