Hello well it is actually a close tie between Genesis and Revelation, both books are phenomenon and full of information. Genesis tells us about the creation of the earth, to be factual the Earth was full of water called "watery deep", Genesis 1:2. The Book of Revelation shows us an "open door" into heaven, with myriads of 'Angels', Revelation 4:1-4.
When we look into outer space do not see one angel, oh of course the realm of the spiritual is invisible, Romans 1:20. What does the Bible tell us is the meaning of life? Acts 17:24-28. Why does God not speak to us? John 9:21. Are people made to be one big family or a bunch of strangers? Acts 10:34-35. Who is the devil and where did he get his start and why? John 8:44. Is there a goal for the future? Romans 6:23. I thought you were asking which Bible book was most exceptional, if you are asking which book period, I would have to say the Bible.
