Encyclopedia du Podlang is located in central Bhutan, one of 20 Bhutanese, covering an area of 1,016 square kilometers. Wangdu Podlangzong is one of the oldest existing castles, and the least maintained and repaired. It still presents the simple style of the 1st century. The castle is located on a high hill, with a rushing yellow-brown river at its feet. Legend has it that when the site was selected, four crows were seen flying in four directions from here, which was the auspicious omen of Buddhism spreading the Quartet, and the final location was determined. I can imagine the difficulty of the construction.