What Lies Beneath?

NASA is narrowing site selection for 2016's InSight (Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport, now that's a mouthful!) mission to Mars to four potential areas. Alas, Valles Marineris did not win out (for good reasons!), but hopefully we'll land something in that spectacular area someday! (Where have I seen that lander before?)