In Trashiyangtse Tshenkharla, just above the school, is situated one of the oldest Dzongs to have been built in Bhutan. Widely known as Tshenkharla Dzong, the ruins are still standing and surrounding it, one can come across the remnants of the settlement such as large stones used for pounding grains.
It was built by Lhasey Tsangma a Tibetan Prince who sought refuge in Tshenkharla in the 8th century AD. He is regarded as the founder of many important clan systems in Bhutan that dominated the political scene till the mid-17th century. A visit to the ruins will give you a glimpse of ancient Bhutan besides a scenic view of the Dangmechu River and Tawang in Arunachal Pradesh in India.