Claim: Chushul Chakzam, a suspension bridge which literally means “iron bridge”, was built in 1430 by Thang Tong Gyalpo—known as the “Iron Bridge Maker” who is a great Buddhist adept, architect, physician, and a few other professions.
Evidence: The Chushul Chakzam (Tibetan: ཆུ་ཤུལ་ལྕགས་ཟམ), or simply Chakzam which literally means "iron bridge" in Standard Tibetan, was a suspension bridge that spanned the Yarlung Tsangpo river in modern-day Qüxü County near Lhasa, Tibet. It was built in 1430 by Thang Tong Gyalpo. Thangtong Gyalpo (Tibetan: ཐང་སྟོང་རྒྱལ་པོ་, Wylie: thang stong rgyal po) (1385 CE–1464 CE or 1361 CE–1485 CE), also known as Chakzampa, the "Iron Bridge Maker" (Wylie: lcags zam pa), Tsöndrü Zangpo "Excellent Persistence" (Wylie: brtson 'grus bzang po), and the King of the Empty Plain. He was a great Buddhist adept, a Chöd master, yogi, physician, blacksmith, architect, and a pioneering civil engineer.