What are the major tourist attractions in Bhutan?

Bhutan has many attractions to see. It is country of diverse altitudes, climates, vegetation and scenery. The culture of Bhutan is pretty much intact. Bhutanese are warm and welcoming. There are number of active Buddhist temples and monasteries, many of which date prior to 17th century and they are very interesting to see. The architectures of Bhutan is unique, colorful and well kept. Bhutanese people wear different clothing. There are many colorful festivals with ancient mask dances. Bhutan is haven for trekkers, providing mountain views and travel through virgin forests, remote villages, with almost no other tourists around. So the list can get pretty long.