The zeppelin USS MACON crashed and sank in 1935.Now MBARI, NOAA, and the US Navy are collaborating on mapping the airship's final resting place and discovering its missing tail fin. Be sure to check out the photo gallery for the shot of the Macon over Manhattan.
I try not to link to stuff I see on Boing-Boing, since that site gets about a zillion times the traffic I do, but Peter Bagge's four-page comics rumination on immigration on is just too good to ignore.