This image shows a natural bridge formation created from erosion by wave action against the rocky promontory. It is part of the Pfeiffer State Beach, in Big Sur, California. The beach has since been renamed Julia Pfeiffer Burns State Park.
The description states:
PFEIFFER STATE BEACH
Near Big Sur, California this popular beach is noted not only for its expansive sandy beaches, but also for its interesting rock formations.
–Not shown here but also very notable is McWay Falls, an 80 foot drop to the beach below, visible from the roadside above. This postcard likely dates from the 1950s.