Video: Time-Lapse of Santiago Calatrava's World Trade Center Oculus

Santiago Calatrava's long-awaited World Trade Center Oculus has officially opened. Thanks to EarthCam and the project's contractor Skanska USA, you can watch the $4 billion transportation hub take shape over the course of 42 months in just 65 seconds, from June 2011 to December 2014. For more, see what the critics have to say about the newly opened building here.