How to Build a Medieval Castle (2016)
For those who are really interested in how to build a mediaval castle, there is one building at the moment in the french countryside called Guedelon. It is modeled from french castle of century XIII. Using tools from middle age. the goal is to validate, correct or invalidate archeoligist theories aboyt medieval building techniques.
By the way you can go there, participate and learn a ton. Myself i really enjoyed the experience.