Chushul Chakzam, a suspension bridge which literally means iron bridge, was built in 1430 by Thang Tong Gyalpoknown as the Iron Bridge Maker who is a great Buddhist adept, architect, physician, and a few other professions.
The Chushul Chakzam (Tibetan: ), or simply Chakzam which literally means "iron bridge" in Standard Tibetan, was a suspension bridge that spanned the Yarlung Tsangpo river in modern-day Quxu County near Lhasa, Tibet. It was built in 1430 by Thang Tong Gyalpo. Thangtong Gyalpo (Tibetan: , Wylie: thang stong rgyal po) (1385 CE1464 CE or 1361 CE1485 CE), also known as Chakzampa, the "Iron Bridge Maker" (Wylie: lcags zam pa), Tsondru Zangpo "Excellent Persistence" (Wylie: brtson 'grus bzang po), and the King of the Empty Plain. He was a great Buddhist adept, a Chod master, yogi, physician, blacksmith, architect, and a pioneering civil engineer. 
