We dug up this great old Sanborn fire insurance map of Alexandria from 1912.
Take a look at the same area today on Google Maps.
[googlemaps https://maps.google.com/maps?hl=en&q=rosemont+arlington+va&ie=UTF8&hq=&hnear=Rosemont,+Alexandria,+Virginia&gl=us&ll=38.819752,-77.073378&spn=0.005502,0.011362&t=m&z=14&output=embed]