The Gunilda was a luxury yacht that sunk in Northern Lake Superior in August of 1911. I dove it in 2004 and then again this past September. Probably makes anyones' list of top 10 wrecks in the world.
edit - I'm not sure why the embed code from Vimeo doesn't work here but it doesn't. So here is the link -
http://www.vimeo.com/16215539
edit - I'm not sure why the embed code from Vimeo doesn't work here but it doesn't. So here is the link -
http://www.vimeo.com/16215539