63 Building Introduction: 63 Building is a landmark building in Yeouido with excellent views. This is a comprehensive skyscraper with 60 floors above ground and 3 floors underground, integrating viewing, dining and entertainment. In addition to the tallest observatory in South Korea, the building also has a cinema, an aquarium, restaurants, etc. When the weather is nice, you can take the glass elevator up to the observation deck and you can see the Incheon seaside in the distance.