Prayer Wheels in Bhutan

You see them in dzongs:-

Trashichodzong, Thimphu

Pungtang Dechen Photrang Dzong, Punakha

On the bridge leading to the dzong; before going into the main building

Entrance to Gangtey Gompa, a monastery near Phobjika

On street corners:

The main street in Thimphu; on the way from Thimphu to the Dochula Pass

Privately built and owned prayer house near Punakha

http://en.wikipedia.org/wiki/Prayer_wheel

http://www.nangkor.bt/PrayerWheel.html