When mayors from around the world touched the 600-year-old bricks of Nanjing's city wall,WhatsApp%E3%80%90+86%2015855158769%E3%80%91crane%20beach%20ma%20directions what did they find? China Daily reporter Xia Ji was on site to uncover the unique stories hidden behind every brick, each one a piece of history, and a link to global heritage preservation! #GlobalMayorsDialogue
