Turkish software engineer Bedirhan Yildirim used AI coding agents and free Polish public data to build an explorable 3D replica of Warsaw in two days. The free online map has almost 200,000 buildings, trams that follow real timetables, live weather and 45,000 streetlamps that light up at night, plus a flight simulator. He says AI did 90% of the job, and the last 10% of human work keeps it from being "AI slop".