Got an obsession with this a bit back. It’s quite interesting. I’ll have to come back to it when I have some time.
It’s just so much work to do all of these lists decently (with pictures, maps, indexes and everything). At least for the time being. I’ll be traveling soon…
I listed the “list source” of the “national” lists as that national entity’s page at the WHC
I was going to link those tentive lists too, but still haven’t for any country but Iceland.
There are too many of these places which haven’t been added. Plus people can just copy the names to the search field anyway..
Anyway, about categories, I think the sites are sorted to some extent by the UNESCO. At least I think industrial heritage is separate. I’ve also seen a book which had a list of “ancient heritage” sites.
There are plenty of interesting lists which we could make..
Send me a line if you make some! :)