See 11 Years of WTC Construction in 2 Minutes

New York City's One World Observatory opened Friday, and in honor of the occasion, EarthCam has released a time-lapse video showing the 11 years of construction of One World Trade Center—in two minutes. The 1,298-foot building is the world's fourth-tallest and the Western Hemisphere's tallest, Time notes, and the observation deck sits at the 100th to 102nd floors. The hundreds of thousands of images used in the video show the entire construction process from October 2004 to Memorial Day of this year, EarthCam notes on YouTube. (More One World Trade Center stories.)