NASA Mars Images Reveals a "Doorway" Structure

[PooperScooper]

makingmusic476 said:

ArtofAngels said:
Cool, I like hearing of this stuff, I'm going to go all out and say yes that's a door =]

I'm going with you, as it's the far more interesting explanation.

Now, I wonder what's inside it? :) 

 

A cave,