The most recent update of Tesla software includes a couple of Easter Eggs, and as the fellows from "Now You Know" discover, there is more than just a hidden "Christmas Show" feature found on the Model X.
Overall, the hosts do a fine job of explaining all the ins-and-outs of what Tesla's recent software suite now enables functionally in the Model X...but also what it can do for "fun".
Specifically, entering the word "Mars" after holding down the Tesla "T" at the top of the touchscreen (in the Model S or X), transports your EV to the surface of the plant (complete with an accurate satellite maps of the Red plant for your to tour).
Also, instead of displaying the location of your old pedestrian, Earth-bound Model X (or Model S) on the plant, your EV is now imagined as a space rover.
(Check out the video from the 10:07 mark for the "Mars Easter Egg")
As noted in the walk-through, the Supercharger infrastructure is a bit lacking at the moment, so you might want to keep your trips on the Martian surface short.
Also of note, when "heading" to and from Mars, your Tesla also converts to a interplanetary SpaceX shuttle...which is kinda cool too.
Time to use that handy satellite map of Mars to navigate your rover around!