The world's largest cruise ship is Royal Caribbean's Symphony of the Seas. It's 1,188 feet long, which is about four times the height of the Statue of Liberty. If you went to a different beach every day, it would take you 27 years to visit every beach in Australia. In some parts of the Great Wall of China, sticky rice was added to the mortar to make it stronger. The most expensive dessert in the world is the Frrrozen Haute Chocolate ice cream sundae, available from Serendipity 3 in New York City for $25,000. Time zones in the United States were established in order to make sure that different train stations had the same time. The Albuquerque Balloon Fiesta is the largest gathering of hot air balloons in the world, with hundreds of balloons taking flight simultaneously.