I haven't posted here in a while, but I've been digging through the NYPL's sudden deluge of public domain works http://digitalcollections.nypl.org/ and realized there are a lot of good resources for map-making. They're totally free and legal to use (although citing is polite).

A lot of floor plans and maps, as well as other bits here and there. Here are a few I came across the other day that I thought you might find handy.

Temple Floor Plans, http://digitalcollections.nypl.org/c...oine-desgodetz

Architectural Floor Plans, http://digitalcollections.nypl.org/c...s-de-1818-1825

Various Objects, http://digitalcollections.nypl.org/c...-illustrations

Decorative Books, http://digitalcollections.nypl.org/c...tab=navigation