Architecture tells a lot about the history of a place. The Bhutanese architecture is globally known and is an absolute marvel to behold. It comprises of Dzong and everyday varieties. Dzongs in Bhutan were initially built as fortresses and served as religious and administrative centres since the 17th century. Bhutan has followed the Tibetan tradition of Buddhist architecture throughout its history. In order to keep the ancient style of Bhutanese architecture intact, the architects are made to design all the buildings with slanted roofs, colourful wooden doors and small windows. This is done to maintain uniformity in the architecture style of buildings in the country. It gives the cities of Bhutan a scenic view just like the dramatic landscapes. The main architectural style of the buildings in Bhutan is Tibetan Buddhist style. Use of iron bars and iron nails are strictly prohibited in Bhutanese architecture. Sky-high buildings and towers are also not prevalent in the country. To make the buildings look attractive the windows are kept small for the first storey and the size gradually increases on the upper floor.