Do you have some particular piece of software or tech demo or game in mind with interesting very large generated 3D worlds?
Minecraft is of course the poster child for very large worlds of interest these days.
Dwarf Fortress crafts an entire continent complete with a multi-century history, the results of which you can explore freely in adventure mode.
Most of the recent examples of 3D worlds like the post tend to do it through wave function collapse.
Minecraft used to create very interesting worlds until they changed the algorithm and the landscapes became plain and boring. It took them about 10 year until the Caves and Cliffs Update to make the world generation interesting again.
I know 'interesting' is subjective, but your comment is demonstrably false. Just type "mario 64 staircase" into youtube, and look at the hundreds (thousands? millions?) of videos and many millions of views.
Redefining “interesting” just so you can provide a completely irrelevant “correction” is bad faith trolling.
There's no secret formula to culture. Some programmers and AI people seem to think there is some magic AI model that will be able to produce cultural hits at the click of a button. If you're a boring person, you're not likely to "get" why something is interesting, or why that part can't just be automated away. No technology can help with that.