Me and Heicko found a strange looking construction while we were grinding monsters out in the fields the other day. Today I ran back to it to take a couple of pictures of it.
We both think it might be some sort of Airship drop-off/pick-up thing as its quite tall and has a gate that looks like it opens and shuts. As you might know Airships are not available in the Beta version, although you can see them flying in the sky sometimes. So if this really is something to do with Airships, chances are we wont find out until the full release.
Anyway, feel free to guess away!