If space seems like a bit of a far-out setting for Call of Duty, as some fans seem to believe, consider that the series could have taken us to ancient Rome. GamesRadar has uncovered information, images and video of a lost Call of Duty game, Roman Wars, which was in development at Vicarious Visions around 2008-9.
Call of Duty: Roman Wars never made it past the prototype stage, but GamesRadar has a good look at what could have been. As one of the sources points out, it's not dissimilar in concept or approach to Ryse, the Roman-themed Xbox One launch game. In the end, though, Activision chose to keep the series grounded in guns.