What is an interesting 400 page non-fiction book to do a book report on?

I have an assignment in my world geography class and I had a whole list of good non-fiction books but I lost it. :( So I am hoping you guys will have some suggestions for me. I like reading about a variety of things but right now I just want something that will capture my attention and hold it for the length of the book. In addition I would like a book that would be okay to write a report on for high school. So anything that comes to your mind is appreciated, I just want whatever ideas that match my criteria. :) Thanks.