Today marks the 14th anniversary of the September 11 terrorist attacks in New York City.

To honor the thousands of people killed that day, a 9/11 commemoration ceremony will be held on the 9/11 Plaza starting at 8:40 A.M. The ceremony will include the traditional reading of names and moments of silence at differetn times throughout the morning.

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Metro looks back at some of the most iconic images stemming from September 11, 2001 to the construction of One World Trade center and the 9-11 Memorial. 

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Check out the official time-lapse video of the construction of One World Trade Center by EarthCam, and take a Google Maps virtual tour of the 9-11 Memorial.