Tsutenkaku tower is famous because lots of famous people from Osaka grew up in the area. However, no Japanese person knows this fact, they all think it's famous because people say it is.
This is a common trait of the Japanese society. Things are famous for perfectly valid reasons, but no one knows those reasons. If you ask a Japanese person, "Why is this place famous?" the only answer you will get is, "Because it is."
Anyway, come along and see more photos from what is possibly the worst tower in all of Japan. I mean there is really nothing good to see, but friends are good. So there's that.