Some time ago, I heard of another theory for the Sodom and Gomorrah story:
An asteroid clipped a mountain in the Alps, causing a landslide in Köfels (but no crater). The asteroid's trajectory had a low angle, which made the mushroom cloud arc over the Mediterranean and over the Levant, raining down fire and such. This asteroid was actually recorded by Assyrian scribes on a clay tablet, but its trajectory wasn't plotted until relatively recently (2008-ish).