The Opportunity Rover on the Martian surface was only expected to last three to six months. Now, seven years later, it is still going strong, and has traveled over 26.7 kilometers from the landing site.
In this picture we see the rovers current location at the edge of the Santa Maria crater, and soon the rover will be off on a six kilometer trip to another, much bigger one. The Santa Maria crater is about 90 meters in diameter. Click this picture a couple of times to see it bigger and in all its glory.
Another perspective of the same thing, but this time from space. It looks like the rover's faint tracks can be seen coming down from the top of the picture.