From here you can get to every image that has been sent back from the Mars Exploration Rovers. By clicking on the links below, you will be taken to raw directory listings of images in folders that show the date the Exploratorium received the image. This may differ from the time the image was actually taken. You can figure out the real time by looking at the file names and interpreting the "spacecraft clock" code. To decode the file name, which includes the camera, filter, time, location, and more, see the README file.

Spirit Panoramic Camera Navigation Camera Forward Hazard Camera Rear Hazard Camera Microscopic Imager Public Information Office Release

Opportunity Panoramic Camera Navigation Camera Forward Hazard Camera Rear Hazard Camera Microscopic Imager Public Information Office Release

README (important information about file names!)

For an interesting way to download, examine and assemble color and stereo images, you might want to take a look at Midnight Mars Browser.