Budding engineers find out the hows and whys of real towers and tunnels, and then construct their own using cardboard, modeling clay, straws, string and other household and classroom materials. Sidebars include current and historical information about famous towers and tunnels around the world, such as the Eiffel Tower, the CN Tower and the Chunnel. Activities and open-ended experiments let kids have fun as they learn principles of science and technology. Kids are encouraged to keep notes about their discoveries for use in other experiments and school projects.