If you fascinated by the odd and intellectual (and are not fainthearted), then pay the College of Physicians’ Mütter Museum a visit. Just a short walk from Suburban Station, this Philly attraction is definitely a hoot! Just a fair warning, though: most of the exhibitions feature very well preserved human remains that have been somehow affected by a medical condition, so if you are generally disturbed by such sights, I do not recommend you visit this museum. For tickets and general information, see:
http://www.phlvisitorcenter.com/attraction/m%C3%BCtter-museum-college-physicians-philadelphia