Like almost all towns in the Kingdom, this Dzong architecture dominates the entire Trongsa horizon dwarfing the surrounding buildings. Built in 1648, it was the seat of power over central and eastern Bhutan. Both the first and second King ruled the country from this ancient seat. Protected from invaders by an impenetrable valley, Trongsa Dzong is an impregnable fortress. The Dzong itself is a labyrinth of temples, corridors and offices holding court over the local community. It is built on many levels into the side of the hill and can be seen from every approach to Trongsa heralding its strength as a defensive stronghold.

Trongsa dzong