The point of accessibility is to enable citizens to have a normal life.
There are several offices/agencies there that employ blind/visually impaired professionals. It was a fluke for me to walk the few blocks to work and NOT encounter at least one blind pedestrian. Hell, taking the elevator in my building had a high chance of a blind person (red tipped cane and all) being on my elevator.
funny that this is ostensibly being used as a positive euphemism for blind, when all it does is put the emphasis on what blind people lack. the euphemism treadmill never ends
They're both mixed-use urban developed areas with large towers, although Crystal City actually seems to have more of those. Both are in the same place, south of Interstate 395 and west of the airport (the Pentagon is just north of 395).
edit: and for reference Wikipedia says: "Crystal City includes offices of numerous defense contractors, the United States Department of Labor, the United States Marshals Service, and many satellite offices for The Pentagon. It is also the location of Ronald Reagan Washington National Airport."