Visitors from across the world flock to the USA's capital to see the country's most famous building, The White House. Other world famous historic sites include the Capitol Building and Washington Monument. With major airports in Washington DC, Baltimore and Philadelphia direct flights are widely available with major scheduled airlines such as BA and Virgin. Baltimore alone boasts more than 150 attractions. Over 700,000 international tourist visited Philadelphia in 2008, a record-breaking figure and a 29% increase on 2007.
