For Brad's benefit, since he has a hard time telling the difference:

Venus Maps:
http://astrogeology.usgs.gov/Project...GEOL/venus.htm

Mars Maps:
http://astrogeology.usgs.gov/Project...GGEOL/mars.htm

Here's where two possible images of Mars can be found:
http://rds.yahoo.com/_ylt=A9G_Rq9Jzy...landmag/pizza;
the first image could be a partially-terraformed Mars, and the lower a more
current view. Or it could be a possible image of Io. YMMV.