I really like building models so that I can see what cities look like from above. It's like Google Maps' 3D view, but better.
That's really interesting! Have you ever played any city building games, like SimCity? 
I have! I'm partial to City: Skylines over SimCity though. I feel like City: Skylines offers more features and allows for more custom builds than SimCity. Overall, it's a more realistic simulator, in my opinion.
There used to be a very good free game called OpenCity, but it was discontinued years ago. 
Oh, that's unfortunate. I've never heard of it--is it still downloadable?
I am not sure it is compatible with anything any longer. The last version was released in 2009. It was a very good city simulator. It also had openly available source code so you could modify it to whatever you wanted. 
Oh, that's too bad. Oh well, I guess I'll just buy Cities: Skylines 2 whenever it comes out.
I know a lot of extra downloadable content was planned for Skylines. Have they released a lot of different packs and expansions? 
They've got a bunch of expansions and extra DLC, definitely. Rumors have it that Cities: Skyline 2 is being developed as we speak.
Why do you think simulation games are so popular? I remember SimCity 3000 being used in a political race or something like that. It is a huge part of culture.