My favorite abandoned New Orleans places in one Flickr set
One Tumblr account has taken several pictures of New Orleans's best abandoned landmarks: One set on the Six Flags; one of the Milne Boys' Home, an old orphanage on Franklin Ave in Gentilly where Louis Armstrong learned how to play trumpet; one of the Market Street Power Plant in the Irish Channel; and one of the Dixie Brewery on Tulane Ave.
The entire Tumblr can be seen here. Be sure to check out the 87 Drive-In Theatre and the Falstaff Brewery even though they aren't in New Orleans.
Seen here is a picture of the Milne Boy's Home in 1950.