On the way from Bumthang to Gangtey you have to pass through Trongsa. A cute little town that has the highlight of the local fortess. The Trongsa Dzong is the largest dzong in the country. It was constructed in the 1600's by Shabdrung, a Tibetan Lama who would help unify Bhutan. It's a gateway between the east and west of Bhutan, so a very central key point for politics of the country.
The last picture is a little past the dzong, and was an old temple on a hill with a monk making a kora (a circling around) of it. I thought it looked very pretty.