An idea that was somewhat suggested in Hidden town thread, here are some mine Suggestions for moving "towns" (posting it here so it isnt offtopic in Hidden Towns thread)
The moving towns would naturally be somewhat tricky to locate -since they move around. Exeting a moving town could also perhaps cause random drop of point on any place the moving town visit, or the visits are scheduled -so its possible to predict its current location.
some ideas of moving "towns"
Sea Floating island with a town on it,
Sky Floating island, with a town on it
A ship that moves between some Portcities
A flying ship
Moving market (vagabond camp of merchants)
Moving Towns
Roupe