This is the Mars lander and rover. The lander (including air bag) is an engineering prototype. The rover is a non-functional model built by the JPL folks for display at the Air and Space Museum. In January 2004, NASA landed two rovers, Opportunity and Spirit on Mars and they have returned many images, as well as other data. Here are a few links to some of the images:
Sol 5 Postcard from Mars
Below is the Lego version of the rover which was given to me a few years ago.