The World's Largest Piece of Limestone

I love it when things are found in such a ridiculous bulk. Leonardo had a desire for a city which was on two layers, and the poor people would live on the bottom layer, and the rich people would live alsolsy. The world's largest piece of limestone is in lebanon. A crystal that they found an is four point four billion years old? Yes, o, it's the oldest. And my favourite thing, by the way, about the wool, the great wool of china, is that, you know, when they say, oh, we found a bit more great wool, you expect it to be five more meters. I don't have any solid information