19. Sampong Department Store

Location: Korea

Year of Fail: 1995

Initially conceived as a four-floor office building, the chairman of the property called for changes during construction that would allow the building to function as a large department store instead. Several support columns were cut away in order to install elevators and the building's air conditioning unit was moved to the roof, creating a load four times the design limit. Moreover, the owner added a fifth floor despite warnings of imminent collapse. In 1995, five years after it was completed, all of the building's columns in the south wing gave way, trapping more than 1,500 shoppers and killing 502 people in a mere 20 seconds.