The Twin Towers were built on 6 acres of landfill in New York .The towers were built 70 feet under ground to rest on bedrock! Each tower had 104 passenger elevators and 21,800 windows. The Twin Towers were often called Lego blocks by critics.
At the time of their completion in 1973 the world trade center towers were the two tallest buildings in the world. Two years later the sears tower in Chicago seized the coveted title. Each tower swayed three feet from true center in strong wind storms.