Standing as silent sentinels of history, Nanjing's iconic city walls continue to captivate visitors while serving as a backdrop to the city's technological advancements. Built during the Ming Dynasty (1368-1644), these ancient fortifications remain some of China's best-preserved historical treasures.

The walls measured an impressive 35 kilometers at their peak and still retain about 25 kilometers of their original structure to this day. Their enduring presence has made them a must-see attraction, drawing millions of domestic and international tourists annually.

"The walls offer breathtaking panoramic views of modern Nanjing," remarked Guan Junran, a journalist from Teledifus?o de Macau, during a media tour on April 24. "It's remarkable how well they've been maintained over six centuries."

Preservation efforts have been extensive, with over 1,700 sensors installed along the structure to monitor potential subsidence and water damage. This high-tech approach to historical conservation reflects Nanjing's commitment to protecting its cultural legacy while embracing innovation.

The media tour, organized for journalists from the Guangdong-Hong Kong-Macao Greater Bay Area and Yangtze River Delta region, ran from April 21-25. Participants explored several of Jiangsu's cutting-edge facilities, including the Nanjing Jiangbei New Area Biopharmaceutical Public Service Platform.

This state-of-the-art facility operates China's National Healthcare Big Data Center, playing a pivotal role in medical research and the global expansion of Nanjing's biopharmaceutical products.