My birthday was a couple weeks ago, right after Christmas. We decided to celebrate with a little trip to Chicago. John has mentioned that he would like to go out on The Ledge also called the Skydeck. It is on the 103rd floor of the Sears which is  now the Willis Tower. There is absolutely no way I could ever have gone out there. And with his iPhone he could send me a picture while I was happy on firm ground. Many years ago I was high up in the Sears Tower and did get to look out and that was enough. I cannot imagine the horror of standing on a glass floor. But he enjoyed himself.

If you'd like to go there yourself here is the info