The Washington D.C. Metro rail system serves the District of Columbia, the Maryland counties of Montgomery and Prince George's and the Virginia counties of Fairfax and Arlington. The Metro system also serves points of interest such as the Virginia city of Alexandria, the Pentagon and the Ronald Reagan Washington National Airport.
As of 2015, the Washington D.C. Metro consists of six major lines. The Orange Line is a east-west line; its western terminus is in Vienna, Virginia, and its eastern terminus is in New Carrollton, Maryland, which is also an Amtrak stop. Other stations unique to the Orange Line are West Falls Church, Virginia and Landover, Maryland. The Silver Line also travels in an east-west direction; its western terminus is in Reston, Virginia, and its eastern terminus is in Largo, Maryland. Some stations unique to the Silver Line are the Virginia stops in Tysons Corner and McLean.
The Yellow Line is a north-south route that usually runs between Fort Totten in the District of Columbia and Huntington, Virginia. During rush hour, the Yellow Line extends to the Blue Line's southern terminus and the Green Line's northern terminus. The Green Line goes between its northern terminus in Greenbelt, Maryland, and its southern terminus at the Branch Avenue station in Suitland, Maryland.
From downtown Washington, the Blue Line heads east toward Largo, Maryland, and south toward Springfield, Virginia. The Blue Line's only unique station is Arlington National Cemetery. The Red Line has a U-shaped route with its bottom crossing through downtown Washington. Its western end is Shady Grove, Maryland, and its eastern end is Glenmont, Maryland.