Other
Nicolas Janberg's Structurae: Eiffel Tower
Information on the Eiffel Tower can be found here at Nicolas Janberg's Structurae, including a chronology of its history, technical specifications, construction details, and information about the tower's architect, builder, and dimensions.
TED Talks
Ted: Ted Ed: What Makes the Great Wall of China So Extraordinary
The Great Wall of China is a 13,000-mile dragon of earth and stone that winds its way through the countryside of China. As it turns out, the wall's history is almost as long and serpentine as its structure. Megan Campisi and Pen-Pen Chen...