Map of Philadelphia in the late 18th c.
As those of you who've seen my Friday Fun Facts posts can imagine, I find sites like this fascinating. <g> I love all the little snippets of historical background, like the one about how Gouverneur Morris lost his leg.
I wish I'd had this map handy a few weeks ago when I was listening to the part of ECHO that takes place in Philadelphia. Obviously it will be very useful for locating the various places in the city mentioned in WRITTEN IN MY OWN HEART'S BLOOD, too!