Okay, as an example, say I wanted to have a Special Item that takes the players party to a secluded town, Perhaps the item is the town but magically shrunken. The problem, how will the town that the players have been in be remembered when they return? This probably wouldn't work at all, considering that even if I did mark the entrance to every town in a stuff done flag, whats to stop them from gating back into a wall? I suppose it could be told that this is a risk of the magic item, but that'd be kinda cheap...
Any ideas?