Tuesday, September 11, 2001 is a day that will never be forgotten. It changed the world forever. Four hijacked planes were used as weapons and killed 2,995 people and 1 dog at the World Trade Center in New York City, the Pentagon near Washington D.C., and in a rural field in Shanksville, Pennsylvania.
New York City firefighters walking past the American flag at the World Trade Center site in New York City on September 14, 2001, three days after the September 11 terrorist attacks. Credit: J01 Preston Keres/U.S. Navy.