futurist-forum/a-600-foot-tall-city-on-wheels-for-when-its-time-to-get-away-from-it-all

http://www.fastcoexist.com/3021415/futurist-forum/a-600-foot-tall-city-on-wheels-for-when-its-time-to-get-away-from-it-all

http://www.dezeen.com/2013/11/25/nomadic-city-caterpillar-tracks-manuel-dominguez/