Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: A Good Overview

I have been fascinated with castles since visiting Edinburgh Castle in Scotland a few years ago. Thie book is an excellent resource for someone who wants an overview of the history of this kind of structure. I was surprised that it is a YA book--I think it is good for all ages...and if, in fact, it was intended for children, the black and white drawings and photos were not very exciting.The author delves into the following topics in five chapters: how ancient forts and siege inspired medieval builders, the development of medieval castles, planning and building the outer defenses of the castles, a castle's inner living spaces, and castles under siege and in ruins.The book begins with a two-page timeline containing the important dates in the building of medieval castles, covering a period of thousands of years.I especially enjoyed the section about life in a castle and how the residents lived and worked there....very interesting.