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 circa 1927. "Harry Wardman Co. Old house, Water & M streets S.W." Lots of old signage here: Palace Athletic Club, a tire billboard, Coca-Cola, Betholine and more. National Photo Company glass negative. View full size.
This is the Ball House:
http://www.flickr.com/photos/rock_creek/577428565/
This building is said to be one of the oldest in Washington, no one being able to tell now just when the structure was erected. It has, however, the walls of a fort and windows which were once embrasures for old flintlocks."
-- Washington Times, March 20, 1904
The house was supposedly part of the estate of George Washington's uncle Joseph Ball.
the "map" page?
[The Google Maps page. - Dave]

How do you post a picture in your comment? Or italicize, for that matter?
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You would need the same HTML code (actually, XHTML) that's used to build entire Web pages. For italics, enclose the tag "em" in pointy brackets, followed by the text to be italicized, followed by slash-em to turn the emphasis off:
<em>This is in italics.</em>
For pictures, use the tag "img src" along with the address of the image:
<img src="http://www.whatever.com/kittycat.jpg" width="490" />
If the image is wider than 490 pixels, you need the width="490" declaration to shrink it to fit the comments box.
For specific examples, right-click on the page you're curious about and choose "view source" to see how something was coded. If you want to show an image that's not already on the Web, you'll need to upload it to a hosting service like Flickr first. -- Dave
I checked Water and M Streets in Google maps, and by gum the 3 gabled house is still standing. Wish I knew how to post it here!
[It's not the same building, if you're thinking of that gas station. The instructions for posting a Street View image are on the map page. (Click "Link," then "Customize and Preview.") Set "width" to 490. Then copy the resulting code and paste it in the Comments box. See above for an example. - Dave]
I'd love to buy a cigar and shoot a game of snooker at the Palace.