...most curious about? (darn that character limit)
There are lots of unclickable little buildings, forests, mines, people, etc on the various land maps of Subeta.
Which little unexplored/unexplained place/person/thing are you most curious about?
I myself am curious about the brown building on the Veta map, in the little forested area behind the Vesnali shop. I'm also curious about that reallllly distance mine opening in the far back of the Riverside map. Totally looks sketchy to me.
the tan half of the sacred lands island... something seriously needs to fill in that space o_o
The whole location around the SAI... there has to be more out there than just that...
The brown house in the hills behind Esthers in Veta Lake and that tall white building with the diamond shaped top in Centropolis.

The forest above Shadowglen probably, but honestly, everything

All of Shengui Guo, but that rather goes without saying.
Also, the massive factory-type building in Darkside. What does it do?
Not so much unclickable, but I wish something more could be done with the Galaxan Wastes other than just the minion feeding. Especially since they've brought it up a bit more in some of the recent Atebus-themed items.
Well, pretty much any building or area that looks like it was designed with a purpose, rather than looking really generic.

And also the park area in centropolis, in front of Saggi's quests. It looks small and even if nothing of interest was put there I'd still like to take a closer look.