Natan35
Mayor of St. Natansburg
There are a lot of buildings that limestone is a pre-requisite for. Academies, bathhouses, colosseums, frankincense merchants, hippodromes, jewellers, mastabas, guard towers, plazas, thermopoliums and triumphal arches all require a unit of limestone (and can be built in multiple cities; also there's a dozen wonders which all require two units. Many of the buildings come towards the end of the game; could it be that you're simply not using the limestone due to your strategy? Someone who is a builder might actually run out of the resource...I normally do.
How many cities do you have in your example and how much have you actually used the limestone?
Well, i settled 3 and captured.... about 11.
I've built about 66% of the wonders available.