Just an update. If anyone is near or around the national mall, several female nidoran, tauros and doduo spawn points (from air and space museum and down towards the smithsonian castle). Unfortunately hackers brought the servers down so I couldn't explore all of the national mall today while I was there with the game. Loads of pokestops, etc. Nothing overly special though. Saw silhouette for Omarstar, Muk, and Dodrio but couldn't locate any of them.