I don't know where that is... I haven't seem it before. I'll take a look later tonight and see what I can see to find out where that exists. I'm guesstimating it's a hidden forum that used to exist somewhere and it was hidden rather than deleted or something.
It's most likely a forum that doesn't have a specific board assigned to it (or category on a board), thus doesn't show up on any of the current boards.
To sae time for my forums check I just click the general talk forum and change the numbers at the end.
Gambling hut is 139
Commerce is 52
Artwork 204
Meeting hall 59
Traders lounge 55
Here 158
That hidden place 58
Newbies 188
And I used to know some others.
Also would I be allowed to use that forum for more private RPs if I wanted less people reading it until whatever happens... happens?