Here's where we're headed next folks!

On the lower right you can see what I thought might be a very large cave. It could well be just a shadow but it might be worth taking a look. IF it is a cave it might be a lava tube (there is a volcanic layer at Gusev) or it could just be a crater from an impact into the side of the hill. Either way it would be fascinating to explore, without actually going inside of course given the fact that caves are not friendly to solar powered rovers. There are other pics of it online here and here. The surrounding terrain around the "cave" looks layered and very interesting, thus it would not be a wasted trip.