Based upon the trolley tracks, we're looking north on 9th. This line died early; it shows up on a 1917 map I found, but it was gone by 1948.

Also, people would walk by and place tiny stickers of trophies underneath of the ones they particularly admired, with the message 'Pls add this pictur to my "Awsome Horses:Winners Only!!" group thx'.

Seriously, though, some of the more vague items here, the ones without horses or obvious horizon lines, are just a bit eerie if you look at them long enough. Seeing faces, but not quite sure if you should be seeing faces.

This one is third row (if you don't count the one stuck behind it from the top) on the right.

Not quite a match - too many guys, too closer together, and on the wrong side of the photo - doesn't work even if cropped.

So if this is the corner of 8th and H Street NW, the perspective is looking north? (There's no Smithsonian American Art Museum/Old Patent Office Building in the background that you'd see if looking south).

The old corner building is still there? The building looks a bit different today (a turret has been added to the front corner) but it and several of her sisters have survived redevelopment? Boy, the neighborhood has changed a lot ...

"U.S.S. New York. 26 men standing on abreast on one of the 14" guns"
Left, second row from bottom:

Hah. Found the big one. "Wilson silver service." Click the image.

[Eggcellent! - Dave]

Any idea where this was? H Street and ? Maybe 7th St? I looked around but couldn't find an address for National Photo of the day.

[815 H Street NW. - Dave]

... find scans of the original negatives of all of them.

Can anyone zoom into the shadowbox on the building to see the pictures displayed for the National Photo Co.?

That would be a neat little bonus for this pic!

[Done. See below. - Dave]

Assuming the display case on the wall at the lower left of the National Photo Company (period) office window contains examples of their wares, your task is to locate scans of all those images and reproduce the exhibit in digital form for our amusement and edification.

[Here they be. - Dave]

I believe the sign for one of the lower-level tenants is for a custom shoemaker and reads C.D. Taylor, To Order.