Trashigang Dzong was built by Chogayl Minjur Tenpa, 1st Trogsa Penlop in the year 1667, overlooking the Dangmechu River. This dzong has been the political stronghold of eastern Bhutan for over 300 years. Today, it serves as the district administration and religious center for the regions’ people. The famous three day Trashigang Festival takes place here at the Dzong’s Courtyard.

Trashigang Dzong or ‘The Fortress of the Auspicious Hill’ was built to defend against Tibetan invasions. This imposing fortress is strategically situated high atop a spur overlooking the Dangmechu River. According to legend it is said that upon seeing the Dzong, invading Tibetan armies remarked that the Dzong was “not on the ground. It is a Sky Dzong” before retreating. It has been the political stronghold of Eastern Bhutan for over 300 years.

Mount Meru is the site of the palace of the Druk Chhoglay Namgyal (victory of Bhutanese Over enemies in all directions). It is accessible only from the north, via a narrow road, paved by blasting through the cliff-side. Due to its location Trashigang Dzong is one of the most strategically placed Dzongs in Bhutan. The present Dzong was enlarged by Dzongpon Dopola, in 1936.

Reference: https://authenticbhutantours.com/trashigang-dzong/