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.
Nano cache hidden in a typical manner. While you are in the area, spend a little time learning about Matthew Henson on the nearby historical information board. If that is not your cup of tea, then enjoy the caches down the trail by other cachers and I.