63 Building is a source of pride for Koreans. While the '63' in its name stands for its number of stories, only 60 of them are actually above ground. At 249 metres tall, my students called it "the highest building in Korea"---as everyone does. But it's not, and hasn't been since 2003 when the Mok-dong Hyperion Towers in Seoul's Yangcheon district were completed. Tower A, a 69-story residential building, is 7 metres taller than 63 Building. Then, in 2004, the ultra-modern residential Samsung Tower Palace was completed in the Gangnam district of Seoul. Tower G stands 264 metres in height---15 metres taller than 63 Building---making it the official tallest building in Korea.