Anson Mount and the cast of Hell on Wheels analyze the unanswered questions from season 2.

Anson Mount and the cast of Hell on Wheels give us a taste of what's in store for season 3.

Anson Mount and the cast of Hell on Wheels give fans a taste of what's in store for Season 4.

Explaining the importance of the golden spike.

A look back at season 5.

Shows the planning and execution of one of the first season's big set pieces.

Includes portraits of Cullen Bohannon, Elam Ferguson, Thomas Durant, Lily Bell, The McGinnes Brothers, Pawnee Killer and Joseph Black Moon.

Gives some background on the following episodes: Pilot; Immoral Mathematics; A New Birth of Freedom; Jamais Je ne T'Oublierai; Bread and Circuses; Pride, Pomp and Circumstance; Revelations; Derailed; Timshel; and God of Chaos

Offers seven short pieces, including "About Hell on Wheels", "The Guns", "The Wardrobe", "The Meaning of the Railroad", "Building the Train", "Locations and Sets", and "Dirty Medicine".

Features quite a few behind the scenes crew, like Director – Executive Producer David Von Ancken and Production Designer John Blackie, talking about what they wanted to achieve with this series. There's some great footage of the sets being built as well as some of the location shooting, some of which looks pretty muddy. It's nice to have the actual crew interviewed at length here rather than the traditional puff piece that focuses solely on the cast congratulating each other for giving such great performances.