Today I am the Washington Metro Blue Line from Pentagon to Rosslyn. The route starts underground at the Pentagon Metro Station in Arlington County, Virginia which has 2 underground split side platforms where trains to D.C. and Maryland use the upper level and trains to Virginia use the lower level. After leaving the Pentagon, the Blue Line continues straight underground in a tunnel. Next it curves to the left. Then it continues straight underground to travel underneath Richmond Important stations: Pentagon Landmark : The Pentagon Arlington Cemetery Landmark: Arlington National Cemetery Rosslyn Landmark: United States Marine Corps Memorial Rolling Stock Alstom 6000 Series Kawasaki 7000 Series