September 11, 2014 marks the 13th anniversary of the 9/11 attacks when the Twin Towers were brought down by terrorists.

9.11.2001 – 13 Photos You Should Never Forget

13 years ago almost 3000 innocent people died when terrorists hijacked four civilian planes. Two of the planes struck the NYC World Trade Center, one crashed into the Pentagon and one crashed into a field in Pennsylvania. In honor to the 13th anniversary we’ve compiled 13 images to remind you of the importance of this day and why it should never be forgotten.