Robert Snedden 
Castles and Fortresses Around the World [PDF ebook] 

Travel back in time and discover everything you ever wanted to know about castles. Find out how they were used for defence and how they kept people safe from attack. From the first wooden castles of the British Isles to the underground fortresses of the Cold War, you’ll get the grips with why and how they were built. As well as medieval architecture, this book explores Roman warrior towns and impressive Japanese structures. Wonderful photographs and a world map help readers understand the geographical and historical context of these amazing buildings.