The first dzong
When Zhabdrung Ngawang Namgyal arrived in Bhutan in 1616 and set about unifying the warring valleys under a single religious-political authority, the dzong — the fortified monastery-and-administration complex — became his principal instrument. Simtokha, built in 1629, was the first he raised, and it is the oldest dzong still standing in the country. Its position was deliberate: on a ridge commanding the junction where the routes from Paro, from the Thimphu valley, and from the south came together, it controlled the approaches to the heart of the country. The name is popularly read as 'atop a demon' — the dzong built over a spot where a troublesome spirit was subdued and pinned, the recurring Bhutanese motif of the sacred structure that pacifies the ground it stands on.
