mull: indeed!
SIR! ian
SIR!
has really done a nice job with setting up this one! this 'group' thing should definitely get things going this week :>
thujon: great work on those previews!
i'm swinging betwen the 3rd and the 4th, though i think compositional-wise the 4th is definitely the best! and i really like the view down on the hole in this one, while still having the camp in the foreground! :)
i'm eager to see more

to your question:
the first is from mind, and for the other two i had google earth still opened; and with this friggin 'terrain-checkbox you can literally dive into this huge crater oO... so looking at that definitely helped me to get things a bit better into perspective..
open the attached file with google earth, and you can get there :)