wtc on Instagram: "Did you know..? On September 11th, 2001, the Twin Towers swayed more than they were designed to due to the impacts of the planes. While the towers were built to sway up to about a foot in high winds, the impacts caused them to sway significantly more, with some estimates suggesting several feet, possibly up to TEN feet. The World Trade Center's Twin Towers were designed to sway slightly in the wind to handle wind pressure, a common feature in tall buildings. Each tower could s