This image shows the Nubble Lighthouse and associated buildings. The official name of the structure is the Cape Neddick Light, which is located on Nubble Island, about 100 yards from the mainland.

The caption on the back states:
NUBBLE LIGHT AT YORK BEACH, MAINE
The famous lighthouse on the Maine Seacoast was established in 1879. Its powerful beam can be seen 15 miles out to sea.

–The close proximity of the islet where the lighthouse is located has made it a popular tourist destination at various times in its history.

This image likely dates from the 1950s.