Masteria Expansions, Names and the proof for each

I was happily running around NLC today trying to find something you might've missed (maybe a bit too eager on that part), but I did notice Icebyrd Slimm (NLC mayor) said something about a museum.

Talk to him and select "What is this place?". He'll mention how most NPCs got to NLC, and at some point he'll say:

"About our resident explorer, Barricade came searching for something; he agreed to bring whatever he found to the museum. I'd heard stories about him and his brother when I was still in kerning city."

It's not really proof of anything, and it probably just is something made up so they can describe why Barricade's there; but if a museum's brought out I CALLED IT!

I had always had a feeling the Yetinx was a museum. If not, it could just be a thing which "exists" in the town, but is not an area which is accessible. You've got to consider that this 2D world is real for these characters, and there's simply no way to translate a full-on city into 2D and have everything there, so they just have the noteworthy stuff. Notice that there isn't any housing elements within the town, when clearly all of these NPCs have a home in the city.