Examines the earliest known tunnels in the world and the physics of how tunnels are built and remain standing in spite of tremendous weight above them.
Examines the history, types, and engineering details of skyscrapers and towers. Includes a timeline, text-related questions, a glossary, a website for further information, and color photographs.
Learn about the building techniques used for the Great Wall of China, the empires who constructed them, and what their purposes were over the centuries.
