They’re called “Matchitecture” and they’re loosely based on the old art of making models out of matchsticks. That’s all upgraded, of course, and in these kits you cut the wood microbeams out with the included tool, glue them together, and presto! You have an amazing model replica.
Of course, it’s not quite as easy as I make it seem. The Taj Mahal model, for example, is made up of 7500 microbeams. (It’s called the Expert Level for a reason.)
I’ve shown a few of my favorite models here, but your tastes may vary, so be sure to check out the complete collection of Matchitecture Architectural Model Kits.