you might say it was a nuclear expolsion or some thing like that ; were did i put that horn again;

http://www.keyway.ca/htm2002/sodom.htm
"Early the next morning Abraham got up and returned to the place where he had stood before The Lord. He looked down toward Sodom and Gomorrah, toward all the land of the plain, and he saw dense smoke rising from the land, like smoke from a furnace." (Genesis 19:27-28)
Whether or not it was a nuclear explosion, as some people now believe, or another sort of natural or supernatural force, one thing is certain - the destruction of Sodom came with great power. Its devastation was so complete that, unlike so many other ancient cities, no trace of it has yet to be found.
The location of Sodom, along with Gomorrah and the other "cities of the plain" is subject to speculation. What is known for certain is that it was somewhere east or southeast of Jerusalem, in the area of the Dead Sea, also known as the The Salt Sea. Some believe that it was at the northern end of the Dead Sea, while others say it was at the southern end. We do know that Abraham was able to see it from the great trees of Mamre, near Hebron (Genesis 18:1, 19:27). Hebron is located about 18 miles (29 kilometers) west of the Dead Sea, at a latitude about half-way between its north and south ends.