Taipei 101 in Taiwan continues to be the second-tallest structure behind Dubai’s Burj Khalifa. This was built in 2004, six years before its formidable rival, and was formerly known as Taipei World Financial Center. A stunning 320 meters lower than the Burj Khalifa, Taipei 101 is located at 508 meters. However, it continues to be the largest green building in the world because it was built with resource efficiency and environmental responsibility in mind. It is also the first structure in the world to reach a height of over half a kilometer.