Instead, I found this great website, Laim's Pictures From Old Books , it is a tremendous source for public domain images. If you don't already know about it, go check it out! Here's one I found...
This house plan would make a great map for a Call of Cthulu scenario, or anything else in the horror genre. "Professor Simmons! There's something strange in the sitting-room! Aaaaaarrrgggghhh..."
"It's been ages since there's been a wandering adventurer..."
Anyway, I hope you find the website of some use.