This is totally fascinating. GoDCer, and early contributor, John sent along an awesome site, which is a gold mine for old maps. This is one of our early favorites.
It is a map from 1935, plotting all the residences housing a juvenile delinquent, according to the Juvenile Court of the District of Columbia.

This is so cool. What was the URL of the site and where can one see the original and other maps you mentioned? As a geography teacher I am also on the lookout for great sites. My thanks in advance.
Can we get a 2013 version?
yes, please share the url of the map site!
what duh website