Ancient cities whose brick and stone walls have literally been vitrified, that is-fused together, can be found in India, Ireland, Scotland, France, Turkey and other places.

• 古城市的砖和石墙逐渐地成了玻璃样,是融化在一起的,在印度,爱尔兰,苏格兰,法国,土耳其和其它的地方中都能被发现。