I like how they can still find its rovers and read their names, even now that it's a gorgeous continental planet and future agri-world (thanks to the Guilli's Planet Modifiers and Features mod which can populate a terraformed world with modifiers favoring a particular district type), with the rovers all overgrown by forest and rusted by oxygen and rain. The terraformers must have found Opportunity and preserved it or something.
It added so much lore to the human empires and the gameplay in general, I find it hard to tell the difference between vanilla and the mod. But one thing I do know is modded, is the 21 farm district squares my Mars got after the terraforming (when my empire isn’t Ocean Paradise with water worlds)- as well as the 20-ish mining squares I got on the hot Trappist planet, and the precursor ruin modifiers on that planet which made it build mining districts super fast.