Antarctica too: if you can get there, you can step onto the ice. There's a pattern here: the only places with open borders are places where you wouldn't really want to live anyway, while the places with the strictest border controls are often those that are quite desirable.
https://www.facebook.com/dheera/media_set?set=a.101010917929...
True, I wouldn't want to live there long term -- the limitations of a small town and no road access to other towns could get depressing after a while. But it was definitely an experience being there for a week.