I'm becoming interested in how Mars missions are planning their landings. One aspect I see brought up time and again is Mars' awkward atmosphere - 'just enough there that you have to care about it'. This picture claims (I cannot vouch for it's validity) that Olympus Mons essentially pokes out of Mars' atmosphere.
Could an unmanned ship have a slow descent onto such a structure? Is it viable to roll down the mountain from there? Wikipedia says it is a 5 degree descent - hardly noticeable (though very noticeable in the picture above...)
I'm sure this has been ruled out for good reasons, I'm just curious what they are.