The Paris Eiffel tower in Vegas is half the size of the actual tower in France. That being said it is still huge. It reaches the top or near the top of most of the large casinos. As you're about to head up they offer you an iPad that at the top shows a virtual reality of France as if your in France's actual Eiffel Tower.
The price is very cheap and I'd recommend trying it. Also it's right in front of the Belogio so you can watch the show high in the sky.