I stumbled onto the Blue Hole in Santa Rosa New Mexico by chance. I stopped in Santa Rosa for the night. I got into town a little early so I went exploring and found a few old buildings and a giant hole in the ground with water flowing from it. The water is crystal clear but chilly. I'm not a diver but it looks like fun. Santa Rosa has a section of old 66 not used since 1937. It's gravel with painted billboards on rocks and wind mills.
http://www.santarosanm.org/scubadiving.htm
http://www.santarosanm.org/