This 10.5-kilometer section was commissioned by Ming general Qi Jiguang, who standardized watchtower design across the entire northern frontier. His 67 towers here include cannon ports and drainage channels — details that signal the Ming wall wasn't just a political statement, it was a serious military engineering project. Qi Jiguang's section is where you start to appreciate the difference between restored and restored-well.
© Jakub Hałun, CC BY-SA 3.0, via Wikimedia Commons