Simcity 4 from 2003, I've managed to put 100h + of effort in to making an 8x8km tile (4x4km tile is the largest) while making it a 15K x 10K pixel image by massively cropping and cutting in Ps freezing my PC in the process, you can zoom in to grasp 1.5 million sims living in this Megalopolis

https://ift.tt/OXGpP8d