In Las Vegas there are more than 155 high rises, most of which are around 400 feed.
Though the tallest building in this busy city just happens to be the Stratosphere Tower which stands at a whopping 1,149 feet. Granted that the Stratosphere is not the worlds tallest building there is, but it is the United States tallest observation tower.
So if your looking for a great look out over the Las Vegas area this would be the very best place in the area to do just that.
As tall as the Stratosphere is, only time will tell if it will continue to stand as tall as it does now or not.
It seems everyone wants to always make things taller, bigger and tougher. So who knows how long the Stratospheres record will stand.
Stratosphere