With the advent of single player tribes, while it is a good thing...has had an undesired effect as well. There are bits of structures everywhere, some finished, some not.....as well as ghost towns in abundance.

When a player moves his totem to new loacation, any structure not completed should auto collapse, or dissappear. Finished structures should be able to be destroyed by anyone passing by as well...or at least damaged...until they reach a point of collapse.