7. Paro Airport, Bhutan. In the world, only 8 pilots have sufficient qualifications to land there. Paro Airport is 2.4 km above sea level and is surrounded by sharp peaks of 5,000 meters, and the length of the runway is 1980 meters long. There are rumors that passengers who venture to land at this tiny airport in the Himalayas are usually showered with soothing pills to survive the landing.