Their names still echo down the ages: The Great Pyramid at Giza. The Hanging Gardens of Babylon. The Temple of Artemis. The statue of Zeus at Olympia. The mausoleum of Halikarnassos. The Colossus at Rhodes. The Lighthouse of Alexandria. The Seven Wonders of the World were staggeringly audacious impositions on our planet. They were also brilliant adventures of the mind, test cases of the reaches of human imagination. Now only the pyramid remains, yet the scale and majesty of these seven wonder...