Just a quick comment about the hotel where I stayed: Loews Philadelphia. Based on some of the reviews at tripadvisor.com, I was a little worried about what I would find when I arrived. But I was pleasantly surprised— the PSFS Building is extremely cool. (That site has great pix of the lobby and SoleFood restaurant, too.)
It was built in 1932 by Howe & Lescaze, and is considered one of the first modern skyscrapers. For more pix and historical info, check out: