If a Homo sapiens from today visited a city of their descendants in the year 1 000 000, they would likely be horrified and revulted.
They wouldn't see crippled radioactive mutants or weird gene altered monstrosities - though slightly ugly because of their reduced jaws and changed body proportions, its citizens would look unmistakably physically human.
What would seem off-putting at first would be their environment - weird organic buildings, a complete lack of ads or cars, bunches of bright monitors hanging over walkways, airport-like voice announcements talking over each other everywhere in the city.
Then other cracks would start to appear - they would notice that people on the streets wear the same clothes and seem to move in full accordance with the strange voice commands and flashing symbols on the monitors. The sight of uniform human rivers flowing from street to street following the speakers' monotone voices, with uncannily similar absent-minded expressions, would invoke in the time traveller's mind images from popular dystopian novels of their time. So little individuality would be in their demeanor, in fact, that even their faces would start looking kind of the same, almost as if they were slightly imperfect clones of one another.
Great, humans have created a global totalitarian tyranny that so many fiction writers warned them about, the time traveller would think. But in all years of their life here, they wouldn't encounter any kind of resistance, nor would they see any propaganda on the countless organic screens - just flashing icons. Furthermore, having travelled beyond the city borders, they would find out that there's not even a semblance of a world government - instead, humanity seems to be divided into hundreds of fully independent city-states, all equally as dystopian as the first one. Even in surprisingly lush forests between the cities no free wild men roam.