Falmouth Inner Light is a lighthouse

Lighthouse

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways....

 listed on the Coast Guard's web site "Historic Light Station Information & Photography: Massachusetts" and the photograph shown was provided there, but there is no other information available on it. It was probably in Falmouth Harbor

Falmouth, Massachusetts

Falmouth is a town in Barnstable County, Massachusetts, United States; Barnstable County is coextensive with Cape Cod. The population was 31,531 at the 2010 census....

at the same location as a current skeleton tower light which is named Falmouth Inner Harbor Light 1. The information shown in the box is for the current light.