In honor of the opening of One World Trade's observation deck, Earthcam has released this official timelapse. From 2004 to 2015, this video shows off the incredible construction of America's tallest building.
As Earthcam describes it: "In recognition of the opening of One World Observatory in New York City, we have released a special edition of our One World Trade Center video. Watch and share this commemorative time-lapse movie showing the completion of construction from October 2004 to Memorial Day 2015. Hundreds of thousands of high definition images were captured over the past 11 years and hand-edited for this exclusive time-lapse movie."