Here’s an image I made with paint.net of Curiosity’s route so far, superimposed on the north infield of the Indianapolis Speedway, of course to scale.

I used the radial gradient in transparent mode to blend it in. I’m a novice at paint.net, and I’ll tell you that it’s a real bear. I’m sure it works real nice once you get adept at it, but the help guides always leave me asking, “Yeah, but how do I DO IT  !?!?!”