As part of his very comprehensive BFG Modpack, Civ 6 modder Ananse has created and introduced a new unit to the game: The journalist, a civilian unit which can do everything from reduce war weariness to serving as a secret agent.
Able to wander past and through rival's borders, see through jungles and detect hidden units, she's perhaps most useful when you focus her strengths on a series of disciplines/perks which can be unlocked the longer she's kept alive and doing her job.
These range from the useful (science journalism grants big tech boosts at each new era) to cruel/real gags about the economics of freelance writing.
Of course, even without those perks, she's still probably most handy when serving as a scout in that time between everyone's borders closing down and satellites revealing the whole map (she's first unlocked in the Renaissance), when exploring the interior of continents can be a pain in the arse.
If you want to try it out, you can download the pack here.