Known as "fortress of the glorious religion", Tashichho Dzong, or popularly known as Thimphu Dzong, is an impressive structure that houses the Bhutanese government and stand on the right side of the Wangchu River (Thimphu).
The Dzong originated with the building of Dho-Ngon (Blue Stone) Dzong on a hill above Thimphu River where Dechenphodrang stands by Lama Gyalwa Lhanangpa. On the 17th century, the followers of Lama Gyalwa Lhanangpa were completely crushed by Zhabdrung Ngawang Namgyal and the Dho Ngon Dzong fell into the hands of Zhbdrung.Zhabdrung rebuilt the fortress in 1641 and renamed it Tashichho Dzong (Fortress of the auspicious religion).
In 1694, the 4th Desi Tenzin Rabgye enlarged the Dzong. The Dzong caught fire in 1698 and was restored. In 1747, the Dzong was enlarged at the initiative of the 13th Desi, Chogyal sherab Wangchuk. The Dzong caught fire again under the reign of the 16th Desi, Sonam Lhendup, and 13th Je Khenpo, Yonten Thaye. After this fire, the Dzong was relocated to the present location.
His Late Majesty Jigme Dorji Wangchuck took the initiative of renovating the Dzong in 1962. The entire Dzong was rebuilt in traditional fashion, without nails or written plans. Zopen Parpa Yodsel oversaw the overall renovation works. In 1969, the earth Bird year, the Dzong was consecrated by Je Khenpo Thri Zur Thinley Lhendup and Dorji Lopon Nyizer Tulku.
In the past, the National Assembly met within the Dzong. Today, it houses the secretariat, throne room, and offices of King of Bhutan. The northern portion is the summer residence of the Je Khenpo and the Central Monastic Body.