impressions from the golden gate bridge in san francisco from may 2, 2017, california usa

2017 advertising american architecture area attractions bay beautiful blue bridge calculation california construction corrosion cost county earthquake engineer engineering experience famous francisco gate golden historical impressions international joseph knowledge known marin mass masterpiece may metal monument most napa ocean orange pacific performance physics pillars planning problems protection realization renewal resistant resonans rope san security sonoma spring stability stable states statics steel strauss symbol technique tourists united usa viability vibration waves weight world worldwide