Founded by English Quaker William Penn, Philadelphia was to become the birthplace of American Independence, and the city’s museums and monuments remind of a dramatic period in history. Prioritising the attractions may prove challenging but first-time visitors should definitely head for Independence Hall, where the US Constitution was signed in 1787, Franklin Square, the Liberty Bell and its famous crack, and Betsy Ross House, where the seamstress may have sewn the first Stars and Stripes flag.