Expandable Fortress
http://www.youtube.com/watch?feature=player_embedded&v=x7v6E6lOzW8 By Ristridyn.
http://www.youtube.com/watch?feature=player_embedded&v=x7v6E6lOzW8 By Ristridyn.
http://www.youtube.com/watch?v=GcYdgudn83M&feature=youtu.be By Jürgen and Martin Stern.
By Gaël Elégoët.
By Draguu. See the full-size image here.
http://www.youtube.com/watch?v=IiWQe6GAzKk&feature=youtu.be By Seliverstoff.
http://www.youtube.com/watch?v=l1yHjwWvNRg&NR=1 A video of the he European Extremely Large Telescope ("e-elt") project by Marco Dima.
http://www.youtube.com/watch?v=R3lmdVMPvNw By Paola.
http://www.youtube.com/watch?v=QC6JVsivW_g&feature=related By Tom Walks.
http://www.youtube.com/watch?v=WosX5wuQE6g&list=UUYRS9H6A89ru-DRDbTL64HQ&index=1&feature=plcp By Beau Dreier Gligoor.
A collection of techno/sci-fi mechanical parts by kuhn0362.