The longest regular commercial flight is from Singapore to Newark Airport in New Jersey. The flight is 19 hours long - non-stop! In some parts of the Great Wall of China, sticky rice was added to the mortar to make it stronger. Canada is the second-largest country in the world by land area, but contains 60% of the world's lakes. The highest state capital in the United States is Santa Fe, New Mexico, at an elevation of almost 7,200 feet above sea level. A suite on Singapore Airlines can cost up to $23,000...but you get a literal sky bed for that price, so. Worth it, maybe? The oldest university in North America was founded in 1551. It's the National University of Mexico, founded by King Charles I of Spain.