The Lord Of The Rings: The Two Towers (Extended Version)

Disc 3: The Appendices Part Tree - The Journey Continues...
Five original documentaries covering adapting the book into a screenplay, the origins of Middle-Earth, designing Middle-Earth, a visit to the Weta Workshop, an in-depth look at creating and bringing Gollum to life.
Two interactive maps: Middle-Earth Atlas and New Zealand as Middle-Earth.
Galleries with audio commentaries.

Disc 4: The Appendices Part Four - The Battle For Middle-Earth Begins
Eight original documentaries cover the filming of The Two Towers, the visual effects, editing, music and sound, stunts and fight training, and a visit to Weta Digital.
Interactive sound demonstration of The Battle of Helm's Deep.
Galleries with audio commentaries.