Tea, compressed into tea bricks, was traceably introduced to Lhasa, Tibetan (Tubo) area during the Tang dynasty (618-907).  Tea pioneers followed the path with natural wonders of long gone Tea-horse caravans. They had to across the dangerous hills and rivers of HengDuan Mountain Range and the rooftop of the World. Those ancient traders could take one-year journey to reach their destinations. The following distinct map, made of Pu-erh tea, shows one of the world’s highest and most precipitous ancient roads which carried precious cargo. We would comment on that TEA also spread civilizations and culture somehow.