In which regions of the world do graduate programs typically require a GRE score? I know that in most U.S. universities, most programs for graduate studies require a GRE score.

1- Are there any graduate programs in the U.S. which does not require this? 

2- Is it required for graduate programs in Europe, Australia or other parts of the world?
Besides the United States, I have not heard of any country and any topic requiring it.