The Mars Rover Opportunity has spent 3 years trekking on the Mars surface and returning thousands of images of the red planet. During its trip from Victoria crater to Endeavour crater, it captured a horizon photograph at the end of each drive, sometimes looking back at where it has traveled. Of these, 309 images were put together to make this time lapse video. It is simply amazing to see how much this rover has gone over sand and rough terrain.
Read more at: NASA.