I don't know of a single place where you can consistently can find "high-quality writing about the world and its inhabitants" as on former NG. There are quality articles but they are scattered against the vast deserts of the Internet.

All over. the hard part is finding it. Some of it gets linked here. A lot of blogs are in depth writing about some niche in the world. (the vast majority are of course low effort drivel, but there is still more high quality content out there than you have time to read)

High Country News, Adventure Journal, Hakai magazine all carry the torch in some form or another.