Pavements in black and white

The pavements of Portugal are particular it seems. A mix of white (limestone) and black (granite) squares making lines and patterns, quite different in different cities and different streets. They are pretty hard. Well, stone is hard. And variously uneven and slippery at times. They obviously last a long time. And they are a cultural expression, ranging from  sweeping curves to geometric boarders up and down the sides of streets, and even pictures of the Madonna, or a landscape, or a cat picked out in a black and white mosaic.  

The thing is there are so many of them. Much lower in terms of carbon dioxide production than concrete. I just wonder if there are some hills or mountains somewhere made of limestone, that are disappearing.