New heights in skyscrapers

I've been to Seoul several times this year and there is a new presence in the city.  It is called the Lotte World Tower.   It not only adds a dimension to the Seoul skyline, but also sets one Korean and two world records.  First, it is the tallest skyscraper in Korea and the fifth highest in the world.  Second, it has the highest glass bottom observatory in the world, at 478 meters or 1,568 feet.  Third, it features the world's tallest and fastest double-decker elevator, called the Sky Shuttle.  For further detail, see this CNN story.