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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 to 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.

What is the world's tallest waterfall? How do dams help generate water power? What happens when a waterwheel spins? This series explores the causes and effects that shape our world. From the underwater volcanoes that sprout into islands, to the rushing waterfalls that spark electric currents, this series demonstrates how both natural and man-made phenomena occur.