2 Peter 2:6
and if God also condemned the cities of Sodom and Gomorrah by reducing them to ashes, thereby condemning them to catastrophic destruction, and making them an example to other ungodly people in the future;
Jude 1:7
So also, in a similar way, Sodom and Gomorrah, and their surrounding towns, which had abandoned themselves to sexual immorality and [sexually] perverted behavior, serve as an example [of people] who [will] suffer the punishment of never ending fire.
Revelation 18:21-23
Then a mighty angel picked up a rock the size of a huge millstone and threw it into the ocean, saying, "This is how the great city of Babylon will be violently thrown down and will never be found again.