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.
Alexandria, Va., 1861-69. "The Marshall house, King & Pitt Streets." Wet plate glass negative, right half of stereo pair. Photographer unknown. View full size. Who'll be the first to put this together with its companion image in a very short flipbook and post it to YouTube? Or it could be an animated gif. Either way, we'd have the world's earliest (and shortest) HD movie.