This is a fun map. It shows the lands of the former ranchos around Los Angeles in 1898.
Link to full-res version at calisphere.
And here is its eastern extension. (The San Gabriel and Walnut valleys.)
Link to full-res version at calisphere.
I refer to these maps over and over again, and I have literally spent hours looking at them. I hope you enjoy them, too!
-Scott
Post on my blog
here.