Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.

Washington, D.C., circa 1904. "North from the Smithsonian Institution." Landmarks include the Willard Hotel at left and Old Post Office tower. 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.
The striking thing is the gaggle of low-rise buildings where the Federal Triangle and the Smithsonian museums along Constitution Avenue are now.
Also visible, the Baltimore Sun Building (aka The American National Bank) with The Cairo behind that in the distance. Elsewhere on Shorpy, an aerial view of the same area.

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