Here you have a beautiful video about the original edition of the Encycopledia. It includes prints with drawings to explain the different concepts included in this magnificient work. 150 people worked under Denis Diderot and Jean Rond D' Alembert's direction and among them there were illustrious enlightened philosophers, such as Montesquieu or Rousseau. In my opinion the Encyclopedia was one of the best ideas in the history of humanity.
There has been a recent exhibition about Diderot and the Encyclopedia in Valencia. Here you have some links with extra information about it: