This is a great German documentary about the Celts, that lived in South-West Germany.
I focuses a lot on Celtic settlements, with nice computer animations and partially reconstructed historical sites.
At 19:25 they speak about a Celtic settlement in Bundenbach, they are producing a 3D reconstruction of it, very enjoyable to watch!
http://www.youtube.com/watch?feature=player_detailpage&v=QwN_ShwD_M0#t=1165
At 35:42 they speak about Celtic Viereckschanzen ("four-corner-rampart") and show a real reconstruction in progress and a finished 3D reconstruction:
http://www.youtube.com/watch?feature=player_detailpage&v=QwN_ShwD_M0#t=2142
Pictures of the Heuneburg, mentioned in this documentary:
https://www.google.de/search?q=heuneburg&client=firefox-a&hs=e5c&rls=org.mozilla:en-GB
fficial&channel=sb&source=lnms&tbm=isch&sa=X&ei=-qcIVOGnMoPnPJnIgJAM&ved=0CAkQ_AUoAg&biw=1920&bih=979
and a 3D animation of the Heuneburg, how it is imagined to have looked like:
http://www.focus.de/wissen/videos/spektakulaere-zeitreise-zu-den-kelten-animation-rekonstruiert-leben-vor-2000-jahren_vid_33156.html
Pictures of the Celtic village at Bundenbach:
https://www.google.de/search?q=heuneburg&client=firefox-a&hs=e5c&rls=org.mozilla:en-GB
fficial&channel=sb&source=lnms&tbm=isch&sa=X&ei=-qcIVOGnMoPnPJnIgJAM&ved=0CAkQ_AUoAg&biw=1920&bih=979#rls=org.mozilla:en-GB
fficial&channel=sb&tbm=isch&q=bundenbach+keltendorf
Information about the Celtic village at Bundenbach with 3D animation:
https://www.planet-schule.de/wissenspool/das-kelten-experiment/inhalt/hintergrund/wie-kaempften-die-kelten.html