The title for the most challenging commercial runway in the world generally goes to Paro International Airport (PBH) in Bhutan. Nestled in a deep valley surrounded by 18,000-foot Himalayan peaks, only a very small number of specialized pilots are certified to land there. The approach requires a series of sharp, manual turns through narrow mountain passes, often battling severe turbulence and high winds, with the runway only becoming visible seconds before touchdown. Other notoriously difficult runways include Tenzing-Hillary Airport (Lukla) in Nepal, which features a short, sloped runway that ends in a 2,000-foot cliff, and the Courchevel Altiport in the French Alps, which has a "ski-jump" incline to help planes decelerate. For major jetliners, Madeira’s Cristiano Ronaldo Airport remains a challenge due to its platform-style runway built over the ocean and the extreme crosswinds that frequently force "go-arounds" for even the most experienced captains.