Sodom and Gomorrah
Accoring to the Bible, they were two cities located near the Dead Sea. Sodom and Gomorrah are told to have been consumed by fire and brimstone because of the depravity of their citizens. Sodom and Gomorrah "have become synonymous with impenitent sin, and their fall with a proverbial manifestation of God's wrath." 
Also, the names are used as metaphors for cities that are destroyed or depraved.
- Wikipedia article on Sodom and Gomorrah Retrieved on 31st Aug 2012