http://worldwind.arc.nasa.gov/

If so, do you happen to know if any of the various cameras have detailed maps of the region in which the "spiders" form? If so, do you also happen to know the rough lattitude / longitude of the heaviest "spider" concentrations, and which camera options give the best/clearest views and/or the best resolution in World Wind? I'd love to explore this region a bit more and see the various features/formations. But so far I'm coming up blank on finding actual photos on World Wind. So, I'm wondering, I suppose if Nasa only uses specific photos of the poles where spiders are covered by the ice caps?

Any other interesting features I might want to take a look at? I'll probably take a nice look at Valles Marineris eventually. I also notice that in the southern region there's a huge impact crater with tons of secondary and tertiary craters clustered around it. What does current theory say caused the main impact and/or all the other impacts so closely associated with it?