This is a variation on the Google Earth or Google Maps websites, but this one is dedicated to our nearest Celestial neighbour, Mars. The main part of the site is a huge map of the red planet shown in visible light, Infra-Red and a highly colourful elevation map, (see the pic). As you would expect from a Google project it is crammed full of links to relevant information, from the names of the various mountains and craters, to the names and locations of all the space craft ever to land there. Hugely detailed, thoroughly informative and beautiful to look at, what more could you ask for?!