I found an entire page at the U.C. Berkeley web site about the Sanborn Fire Insurance Maps. These remarkably detailed works are among my favorite maps ever, and I wish the collection was available online. I used to go look at the few books of them that were available at the downtown library in Los Angeles, and found them endlessly fascinating. Now, at those libraries which have them, they can usually only be seen on microfilm, in black and white. The books of big, color maps are rare, and now considered too valuable to be brought out to be touched by the vulgar public.
Also: Brad being Pwned by a Segway.