"It is a symbol of our history, our identity and our connection to the past," he says. "By protecting it, we honor the sacrifices of those who came before us, and inspire future generations to cherish their heritage."

Listed as a UNESCO World Heritage Site in 1987, the Great Wall was built over the course of 2,000 years, with construction continuing from the Spring and Autumn Period (770-476 BC) to the Ming Dynasty. Existing sections add up to a total length of more than 21,196 kilometers, and pass through 15 provinces, administrative regions and municipalities, according to the National Cultural Heritage Administration.

That symbolism has encouraged Wang to remain steadfast in his mission, which began in 1991, when he was appointed as protector after a devastating earthquake in October 1990 forced many to seek refuge near the ancient structure.