Washington DC's Metro system is a great way to get to hundreds of popular locations and attractions in and around Washington DC. Metro's six lines and 91 stations are located in Washington DC and neighboring Virginia and Maryland. With over 700,000 trips every weekday, the rail system provides easy access to popular attractions including the National Mall, National Zoo, White House, Washington Nationals Park, and much more. The system also provides access to other area transit options, including a station at Ronald Reagan Washington National Airport and Union Station (with Amtrak, MARC, and VRE train service), and MetroBus express routes to to Dulles International Airport and Baltimore Washington International Airport.