The first tower hotel that I have seen is Stratosphere Las Vegas. It is considered to be the tallest tower in Las Vegas and the 5th-tallest structure, in the United States. It is said to have a height of 1,149 ft (350 m). Sad to say, I was not able to go-up on top of it. Maybe in my next visit.
We just happened to pass-by Stratosphere and this is one of the snapshots I took. I hope to make a better picture in my next visit.