The Nanjing City Wall is a historic fortification located in Nanjing, China. Built during the Ming Dynasty in the 14th century, it stretches approximately 35 kilometers and is one of the longest city walls in the world. The wall was constructed using local materials and features watchtowers, gates, and a moat, serving as a defense against invasions. Today, the Nanjing City Wall is a popular tourist attraction and a UNESCO World Heritage site. Visitors can walk along its well-preserved sections, enjoying views of the city and learning about its rich history. The wall symbolizes the strength and resilience of Nanjing throughout the centuries.