starting on Feb. 2009.
story 520-foot-tall skyscraper in
| was engulfed within 20 minutes, and burned
for at least 3 hours
|Feb. 2005, Hotel windsor, Madrid spain,
which burned for 2 days.
structural core was weaker than that of the WTC towers,
top floors collapsed onto lower ones,
the overall structure did not collapse. 
Meridian Plaza fire in Philadelphia burned for 19 hours but did not cause the
building to even crack.  The First Interstate Bank Building in
Los Angeles burned for more than 3 hours with bright intense flames. There
was no damage to the main structural members . On