Norman Rockwell Cave of the Winds Poster

I found this poster a while ago and even though I'm not working at the Cave of the Winds anymore, I just love this! This is a Norman Rockwell poster, and I think it is for the Cave of the Winds in Colorado, although chances are it may be the Cave of the Winds at Niagra Falls that was visited by Rockwell. Maybe he never visited either cave. If you know more, please let me know, I love reading your messages and comments!