About two thousand years ago, Philo of Byzantium wrote that “Everyone knows of the renowned Seven Wonders of the World, but few have set eyes on them”—he was thinking about transportation problems but today we can’t see them because most no longer exist. Hence, if we want to imagine these iconic monuments and the communities that built them, then we must rely on ancient descriptions and modern research. In this book, I have brought together science, engineering, and technology to deepen our understanding of the Wonders: their geographic and geological context, what they looked like, how they were built, the materials used, and the forces that led to their demise.