I've read Dan Brown's angels and demons
Fascinating book. I'm still trying to remember if have read da Vinci code.
Books are a great insight into the world, fictional or non-fictional books. Like one author said:
a reader/writer lives a thousand lives
And about having answers to all of your question, that I believe is a life-long quest. The more you know, the more questions you have. So you can say it is an unending search.
I have read it too. All other Dan Brown's books are great and it give us some answers and of course it leads us to thinking what is gonna be next. How he describes cities, for example Barcelona, it gives you information what to see. I recommend you to read everything from Dan Brown. :)