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Flaming Crater, Darvaza Turkmenistan http://www.youtube.com/watch?v=TEjoga1yrn0

Looks you are right. Still amazing though. I'm going to edit the comment. Thank you.

http://en.wikipedia.org/wiki/Door_to_Hell

Wow.

Hard to get a sense of scale, but it looks pretty big. Maybe a few hundre feet in diameter?

Also, how much heat is needed to set friggin _dirt_ on fire?

That's natural gas seeping out of the ground.

Yeah, an impact crater wouldn't look like that. It would look like one of the craters on the moon with large amounts of ejecta thrown out radially around it.