Mighty Twin Towers are laid low on a day of infamy

The Sept. 11 attack leveled the 110-story World Trade Center in under two hours, an hour and 45 minutes to be exact. At 8:45 a.m., W.T.C. 1, with the antenna on top, was hit. Eighteen minutes later, W.T.C. 2 was struck; it collapsed first in a huge cloud of dust and smoke, at around 10 a.m. A half hour later, W.T.C. 1’s antenna wobbled, then the tower imploded downward, the weight of the top floors pancaking onto those below.