Sin­ga­pore Chan­gi Inter­na­tion­al Air­port has been named the best air­port in the world by the con­­sumer-avi­a­­tion web­site Sky­trax for five years in a row. It’s easy to see why, as the air­port’s ameni­ties include mul­ti­ple gar­dens, a movie the­ater, and a swim­ming pool.