Just in case anyone was wondering...I found some potentially useful maps over at the Marvel Guide. Each map points out important fictional locations that exist in the Marvelverse (eg. ESU, the Daily Bugle, etc.) as well as real-life ones (eg. Columbia University, Central Park, etc.):
If you browse around a bit more, you'll find maps for loads of other locations (not just within America either...pretty much anywhere a Marvelverse story has taken place) ^_^ Hope someone will benefit from it in some way!