Benjamin Franklin proposed the turkey as the national bird but was overruled by John Adams and Thomas Jefferson, who recommended the bald eagle.
Every 4th of July the Liberty Bell in Philadelphia is tapped (not actually rung) thirteen times in honor of the original thirteen colonies.
President John Adams, Thomas Jefferson and James Monroe all died on the Fourth. Adams and Jefferson (both signed the Declaration) died on the same day within hours of each other in 1826.