intoxicated in Tolkien's universe

In a full amazement of how Tolkien could fabricate the intricate and complicated world of middle earth. Not just a narration of some plots or a fabrication of few characters; but the whole damn universe, along with the mythology, history, language, custom, and the geography! I can't even imagine how much time and energy could he spent on building this realm. Even those religious scripts out there couldn't outmatched this masterpiece...