This is on the Nasa Modis site. It's a great shot of the Michigan Basin, which I think is one of the most mysterious geological phenomenon of this area.
Here, in the middle of a 'rock-solid' continent, is a big basin that slowly sunk to the centre of the earth (to the Moho, at least!). What caused this? Note the circularity of the lake shorelines around it. All the region got sucked into this, including my fav. Bruce site. I've studied it, but have never understood it.
There, wasn't that a good intellectual break from disasters, and general political incompetence?