14th and Columbia
Below is a shot of the building on the northwest corner of 14th and Columbia, where the 7-Eleven is today.

We have a lot of cool stuff posted about Columbia Heights. Make sure you check them out, especially this one.
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You have to check out this guy’s Flickr album from the riots. They’re really incredible. He also has a ton of amazing old photos that you should check out.
Source: Posthumous DCC