(At Tachog Lhakhang you will be crossing a six hundred year old bridge built by the renowned iron bridge builder Drubthob (or the Realized and Accomplished One) Thangtong Gyelpo, a fourteenth century saint who built over fifty eight iron bridges throughout Tibet and Bhutan, mainly with the intent of helping pilgrims get to holy places.  He has often been referred to by scholars as the Leonardo Da Vinci of the Himalayas, given his amazing repertoire of talents that ranged from sculpting and painting, engineering, composing operas, music and poetry, to his scientific and ingenious abilities, besides being a great wandering scholar and an accomplished saint. Just next to the bridge, beautifully perched atop a hilltop is a temple – Tachog Lhakhang, which translates as ‘Temple of The Hill of the Excellent Horse.’ It was built by Thangtong Gyelpo in around 1420-30, after he had a vision of Tamdrin, the wrathful form of Chenrizig/ Avolokitesvara – the bodhisattva of compassion, with a horse neck on his head. Today it is a private monastery maintained by his direct descendants. Though a private establishment it can be visited upon due permission being sought. Thangtong Gyelpo was a great votary of Chenrizig, and so the main shrines at the temple are dedicated to the deity and his emanations. Of the many precious relics at the temple, the most interesting one probably would be a special and secret biography of the saint that is said to be visible only under water. )