Only after the end of the century did the tallest sl building appear outside North America with the opening in Taipei of the first building to be more than half a kilometer a tall, Taipei 101. However, all of these were to be dwarfed by the opening of the Burj t Khalifa in Dubai in 2010, which showed an T incredible 62% increase in height on the previous world's tallest building. Most new record holders had only ever shown an increase of between 5% and 20% Countries and cities have been competing with each other for centuries to hold records for the tallest structures. To many people tall buildings are a sign of