At one point during my T, Z, and N-scale (1:450, 1:220, and 1:160) miniature buildings and scenery experiments on Shapeways [a 3d printing service], I - just for fun - drafted this insanely elaborate design for a condensed T-scale version of Texas, my home state, complete with the landmarks of all the major cities, any city with over 100k residents would be represented in this 15-ft. wide miniature diorama. 
It would've taken an insane amount of time and cash($7500+) to actually do this, so of course I'm not going forward with it or anything like it, ever. At the time I made this absurd plan, I was launching a (ultimately unsuccessful) line of miniature buildings on Shapeways. The shop there is now closed, but I continue to retain the web domain NscaleScenery.com for possible future use.
Since then, I've come up with a far more practical and cost-effective way to mass-produce correctly-scaled miniature buildings, one which avoids 3d printing entirely. That may yet become a new product line by early 2021- if things go well enough here to make it happen. 

Note: If my (also miniature related) project 'Miniature Multiverse' turns out to be reasonably successful, this could really happen [among many other cool things!] A new product line would still be showcased in some manner using a local model railroad set. The product line could include customized kits, maybe even a premium 'designed to order' kit for those wishing to recreate a specific real-world structure for, say, a school diorama. I've done so quite effectively for one family member, by shipping a set with instructions for recreating the 'Old Red' courthouse in Dallas, TX. Images of that one-off building kit example, and a possible layout showcase design that could contain dozens of building kits, are shown below. 
The banner links at the bottom of each page include links to my own webpages, links to my storefronts/shops online, and occasional links to other [third-party] verifiably legitimate stores and services I've hand-picked, vetted, and used myself. 
That said, I'll openly disclose that when you buy something from another vendor using these links, for example, a link to Amazon.com, I will get a small fraction of the sale amount and will use that as a means of supporting and expanding the projects I'm working on here. These ads for other vendors, as well as - especially! - links to my own shops, are helping me keep these sites online and growing with new content on a more frequent basis.