If you take a cab over to old city that is where you will find most of of the historic attractions and some good resturaunt/bars. The Rittenhouse square area has some great restaurants as well.
Some recommendations :
Franklin mortgage and investment company - - Speak easy type bar in Rittenhouse square.
Fogo De Chao- Brazilian steak house chain amazing!
Steven starr is a big name for resturaunts in philly. Google anything by him and they are usually top notch.
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