Matthew Henson was the first African American Arctic Explorer, which kind of makes him like a geocacher in the winter climates here. The park named after him is a greenway along the Turkey Branch of Rock Creek. The park runs from Aspen Hill to Layhill, Maryland, linking the Rock Creek Trail with the Sligo Creek Trail.
You are looking for a sandwich container, and the coordinates say it is right on the trail. You know what to do. Please remember to re hide the cache as well or better than when found. This is a very high traffic area.