On the morning of September 11, 2001, two hijacked commercial jetliners struck the Twin Towers in Lower Manhattan, a third plane struck the Pentagon, and a fourth crashed in rural Pennsylvania. A total of 2.977 people were killed in the terrorist attacks. In the face of this unprecedented loss, the city of New York promised to rebuild Lower Manhattan as a lively neighborhood while honoring and maintaining the memory of this day. Thus began one of the largest reconstruction projects in New York City, a process that is still ongoing now, 23 years after the tragedy.