To see these photos of the World Trade Centre, destroyed eleven years ago today, that still look so real is like looking at a picture of a dead family member in their prime. Built 1966-73, destroyed in 2001 killing 2,750 people. The tube-frame design allowed open floor plans as the loads were carried via perimeter columns forming a Vierendeel truss. Architect: Minoru Yamasaki Engineer: Worthington, Skilling, Helle & Jackson. New York, USA.