In honor of the grand opening of One World Observatory, the people at Earth Cam released an amazing timelapse video showing the construction of One World Trade Center.

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This stunning clip shows a compilation of still images from October 2004 until Memorial Day 2015, capturing it from its foundation to the top of the spire at 1,792 feet. 

According to Earth Cam, hundreds of thousands of images were used to create this mesmerizing timelapse video.