Most of these can be found with links here: http://www.philadelphiapass.com/attractions/
Philadelphia things to see and the grade they correspond to:
- Betsy Ross house, Colonial America, Revolutionary War, (low $) 1,3,
- Elfreth Alley Colonial America, (low $) 1,3
- Benjamin Franklin sites and tour, 1, 3, k
- Liberty Bell and Independence Hall, Colonial America, (free) 1, 3
- Lights of Liberty 3D movie, about independence and why it is important to remember, (moderate high $) all grades
- National Constitution Center , 1,3, 8
- National Liberty Museum 1,3,7
- Philadelphia Zoo K, 3,5
- The Academy of Natural Science of Drexel University, all grades
- The Franklin Institute, Science, all grades
- The Philadelphia History Museum at the Atwater Kent , 1,3 Colonial, not sure on the other grades, but likely has some immigration and industrial rev. era things. 2,6
- Gettysburg. You CAN NOT miss this National Park. So much history. Free 1, 3