Here's how 7 US cities still remember 9/11, 25 years later

The Tribute of Light in Manhattan is one of several September 11 ceremonies held in New York City. Bloomberg/Getty Images This year marks the 25th anniversary of the September 11, 2001, terrorist attacks. Cities across the US have found ways to commemorate the attacks and those affected by them. New York City has the Ground Zero ceremony, but there are traditions from coast-to-coast. Today is the 25th anniversary of September 11, 2001, when terrorists hijacked four commercial passenger planes , crashing two into New York's Twin Towers and killing 2,977 people. Another plane hit the Pentagon in Arlington County, Virginia, and the fourth plane crashed into a field in Shanksville, Pennsylvania, after the passengers on board attempted to retake the cockpit and overcome the hijackers. Since the attacks, the US has created over 1,100 memorials across all 50 states where visitors can reflect and honor those who died.