The skyline around 30th Street is such an iconic part of Philly, sometimes it’s easy to forget the area once looked very different.

A new gif, put together by University of Pennsylvania graduate Corey Fader for a class project, shows the change in developments around the Schuylkill River over the past 70 years. Fader combined an old 1946 photograph of the area - last published in Technical.ly - with one he took recently, and the change is pretty striking.

You can see the Philadelphian apartment building go up at 2401 Pennsylvania Avenue. See Circa Center pop up around 2004, watch the train tracks turn into Schuylkill River Park, and even catch a glimpse of the art museum’s 1970s renovations.