Hailed as the "Cradle of American Independence," Boston is filled with historic sites. Boston was America's first great city. In the 19th century, Boston was rightly described as the "Athens of America." Today this city of 800,000 retains its vitality, combining historic districts with revitalized urban centers while remaining faithful to its venerable roots. It is a city every American should visit at least once. Follow the Freedom Trail along three of the most historic miles in the country. See the site of the Boston Tea Party, trace the route of Paul Revere's famous ride, and stand on the bridge where Minutemen fired "the shot heard 'round the world." In the old Charleston Navy Yard you can see the USS Constitution, the nation's oldest commissioned warship.