In an earlier post I mentioned that I would be interested in a Mars-simulation in Second Life. Today I was flying around in 2l, not knowing what to do. So I followed a railway, passively looking out for a nice scenery that might pop up. And there it was: Mars, hanging in the sky.
You can see the Grand Canyon of Mars!
But, it is not what I am thinking of: my plan is to sript a complete simulation of a Mars-like environment, where you can try out how it is to live on Mars, including living in a habitat, growing your own food in a greenhouse and having to deal with all hazards of the Martian atmosphere.