 MD 117 is an L-shaped highway that connects the rural western Montgomery County communities of Dawsonville and Boyds with Germantown, Gaithersburg, and Interstate 270 (I-270) in the suburban central part of the county.The highway also provides access to Seneca Creek State Park, the National Institute of Standards and Technology, and several commuter rail stations along MARC's Brunswick Line, which the highway parallels.MD 117 was the inspiration for the 1971 hit song "Take Me Home, Country Roads".