San Francisco's Golden Gate Bridge spans tidal currents, ocean waves, and battering winds to connect the City by the Bay with the Redwood Empire to the north. With its gracefully swung single span, spidery bracing cables, and zooming twin towers, the bridge looks more like a work of abstract art than one of the 20th century's greatest practical engineering feats. Construction was completed in May 1937 at the then-colossal cost of $35 million. .