Finally tonight here that famous headline all those years ago declaring, yes, virginia, there is a santa claus. Reporter: We set out to show all of you at home the famed macy's windows here in new york city coming to life every christmas. This year that famous newspaper headline from so long ago, yes, virginia there is a santa claus, the publishers writing that after they were asked is there a santa claus. I am 8 years old. Some of my little friends say there is no santa claus. Papa says if Santa Claus phone call you think it, it is so. Please tell me the truth, is there a santa claus? Reporter: They answered that little girl in 1897, yes, virginia, there is a santa claus. Years later the real virginia all grown up, still reading the answer she received to that question, this time to the next generation of children sitting right before her. Yes, virginia, there is a santa claus. He exists as certainly as love and generosity exists. Reporter: All those years later, virginia was still moved by w they wrote back to her. Alas, how dreary would be the world if there were no santa claus. It would be as dreary as if there were no virginias. Reporter: Virginia o'han lon would share her story through the years. Listen to this radio interview we discovered from 1973. First we would like to know your reactions of your letter. I took the editorial literally but found it overwhelmingly convincing. Would you tell us something about your christmas in 1897? Was it particularly happy? My christmass were so very happy. Reporter: Tonight more than a century later, those windows in new york city telling her story all over again, virginia answering the most important question of them all. Do you still believe in santa claus? I've had much reason to. She has much reason to and tonight the proof, look at the radar, the famed norad radar, santa in the air tonight. Hope you've been good. Merry christmas.
http://www.youtube.com/watch?v=I9NlwwrM-vw
This transcript has been automatically generated and may not be 100% accurate.
