2h 21min, sep 11, 2001 y - the twin towers fell
Description:
 On September 11, 2001, at 8:45 a.m. on a clear Tuesday morning, an American Airlines Boeing 767 loaded with 20,000 gallons of jet fuel crashed into the north tower of the World Trade Center in New York City. 
Added to timeline:
Date:
2h 21min, sep 11, 2001 y
Now
 ~ 24 years ago