Paro, Bhutan - May 17, 2012 : The only international airport of Bhutan is Paro Airport which considered one of the world's most challenging aiports. As of October 2009, only eight pilots in the world were certified to land at the airport because it is located in a deep valley on the bank of the river with surrouding of the high mountains. This picture was taken on May 17, 2012 in Paro, Bhutan