Engineering Marvels
I also heard the kinetic force of each airplane striking a tower (taking into account airplane weight, velocity and the fact they were loaded with fuel) was equivalent to 1/20th of that of the nuclear bomb dropped on Hiroshima. Like Joe G. said, the towers took the impact of the collision just fine, it was the ferocious 2000F jet fuel fire that ensued that led to their demise. The steel used in the towers would begin to lose its strength at 800F and begin to melt at only 1500F. As tragic as this was, the fact the towers stood for roughly an hour after impact literally saved TENS of thousands of lives.
I agree the buildings should be rebuilt to be the tallest in the world. WTC Tower 1 was 1362 feet and Tower 2 = 1368 feet, which was only 100 feet or so less than the Petronas towers. But one thing the Twin Towers had over the Petronas Towers. . . Floor Space at the top. The Petronas Towers taper down considerably by the time you reach the top and have nowhere near the WTC square footage on the top floors.
If there is anything "cool" about this terrible tragedy, it is that NYC STILL has the 2nd tallest building in the United States. . . the 102-story, 1250 foot
Empire State Building 
Of the numerous skyscrapers around the world surpassing the 1000 foot mark, only the Empire State Building was built before 1974. It was completed way back in 1931

. What is more remarkable, it took only a year and a few days to build the entire structure.
Vaughn