This second book in the series "Unfolding History" features amazing aerial photographs of 29 of the world's greatest castles, fortresses and citadels, including the Tower of London, Alcratraz, The Great Wall of China and Palmyra. A spectacular fold-out photograph of each site enables the reader to see the monument in thrilling detail, while accompanying text provides information on the site's history and construction. This is the perfect giftbook for anyone interested in, or wanting to learn more, about some of mankind's greatest architectural legacies.