9/11 Memorial – As It Happened – 1720 Later that day, at 1720 – 7 World Trade Center, a 47-story building, collapses. https://soldiersystems.net/2024/09/11/9-11-memorial-as-it-happened-1720-5/?utm_source=rss&utm_medium=rss&utm_campaign=9-11-memorial-as-it-happened-1720-5