I have been up in a hot air balloon! That was fun! Especially the crash landing and the counting of our bruises in the local pub!~ : D
Now open, I can not do. The Tower of Americas in San Antonio probably 500 feet. I hugged the middle and it probably took me 15 minutes to get to the rails. I did it because I'm no chicken but I got back as fast as I could. I felt the platform was swaying.