Nearly 90% of Mars’ surface has been mapped by the high-resolution stereo camera on ESA’s Mars Express, which celebrates ten years since launch this June. The mosaic above comprises 2702 individual swaths of the martian surface, up to and including the spacecraft’s 10 821st orbit of the planet, which it completed on 30 June 2012.
In total, 87.8% of the surface has been mapped at any resolution, with 61.5% mapped at a resolution of 20 m per pixel or better. The map is equatorially aligned, meaning that regions at the poles appear distorted.
Here is the BIG tiff file of the image, I would put this on my wall.