As the National September 11 Memorial Museum opens its doors to the public this week, EarthCam, the live webcam company that has trained its cameras on the site since a few days after the attacks, is offering a look back on its construction. The museum and surrounding memorial have been more than a decade in the making, and EarthCam has captured 4,617 days of footage, cutting more than a million images into a timelapse that shows how the 16-acre site has transformed since 2004.
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