Archeological evidence of Sodom and Gomorrah found at these sites. End Genesis 18 and beginning of 19 is where I am reading this morning. There are many photos of the brimstone and sulphur. There are photos of the round balls unlike any found elsewhere on the earth.
Ash and brimstone still remains the sin of "Sodom and Gomorrah". The biblical account of Sodom and Gomorrah is recorded in Genesis chapters 18-19. The Lord informed Abraham that "the outcry against Sodom and Gomorrah is so great and their sin so grievous. Jude 7 declares, "...Sodom and Gomorrah and the surrounding towns gave themselves up to sexual immorality and perversion." "What was the sin of Sodom and Gomorrah?" http://www.gotquestions.org/Sodom-and-Gomorrah.html
Strange city-like formations are seen in the rock cliffs south of the Dead Sea. Some suggest the ruins of Sodom and Gomorrah can be found in this area. The Bible locates the cities in the plains south of the Dead Sea.