MAPPED: Americans are flocking to historic cities like DC and Boston for the country's 250th anniversary

Source: Business Insider

The Washington Monument as seen from a Ferris wheel at The Great American State Fair, celebrating the US's 250th anniversary. Finn Gomez/Getty ImagesTravel demand for Washington, DC, over the July 4 weekend is up 120%, according to data from Trivago. Boston and Philadelphia are surging in popularity, too, as Americans flock to historic cities.