I happened to see this 2018 article about a New Hampshire gentleman who has an awesome "World Out of Model Trains." It's a real beauty.
Here is a link to Valley News's article on his layout: https://www.vnews.com/trains-mackie-122218-22291767
Also, here is a YouTube video showing footage of his layout: https://www.youtube.com/watch?v=wmWhd5AS5C8
I'm sure those of you who have not seen this before will get a lot of ideas for your layouts.