Cities: Skylines is a city-building game (much like Sim City) published by Paradox Interactive in 2015. There are thousands of community created mods and assets (buildings, roads, vehicles) to download through Steam Workshop.
This game is a must for anyone interested in building-simulators. One of the benefits of the game is its playability. If you’re a novice, you city will do just fine. If you’re a micro-manager you can do that too—up to the scale of timing traffic lights, in fact.
On Steam, it’s on sale from time to time and most new computers can handle it—although I have a MacBook Pro from late-2014 and it sometimes lags when I’m playing larger city.