It was built in the 16th century by a Tibetan Lama Nawang Chogyal. The five storied fortress is perched on a hilltop and flanked by a hair-raising ravine descending to the basin of the Pachu-Wangchu. It was once one of the main centres of Drukpa Kagyudpa teachings, the state religion of the country. From the fortress one can view the lush green forests of Chukha Dzongkhag with the highway running across it.