Philadelphia is one of the most underrated great cities in America. As America's first capital it is full of history, museums, amazing architecture, parks, and delicious restaurants.
My family and I recently spent a day in center city and really enjoyed ourselves. We went to the famous Love Park. We gorged ourselves in Reading Terminal Market. We went to the Mutter Museum and walked around City Hall.
It was a nice weather day so we were able to take the train in and walk the city. There is something so nice about a walkable city. You really get a feel for the beauty of the place and an appreciation of the neighborhoods.
I would recommend anyone spend at least a day in this great American city!