These aerial photo mosaics shot over DC in the early 20th century are incredible.

Aerial photographic mosaic map of Washington, D.C., Sept 13, 1922
https://www.loc.gov/resource/g3851a.ct004537/?r=0.132,0.313,0.095,0.079,0

Aerial photographic mosaic, Washington, D.C., 1918
https://www.loc.gov/resource/g3851a.ct004536/?r=0.047,0.534,0.27,0.225,0

It is striking to me just how built-up the city has become over the last one hundred years. Looking at the mosaic from 1922, I’m not certain there is a bridge across Canal Rd. at the future site of Arizona Ave. It appears there is only the bridge across the Canal. Perhaps there was a smaller bridge there? My sources are not clear. More research is in order!