In 1964, Andy Warhol filmed the Empire State Building for about six hours, which resulted in a stretched out, 8-hour-long silent film called Empire. The shoot took place on July 25th and 26th, from 8:06 p.m. to 2:42 a.m.—so this weekend marks the 50th anniversary. And the Empire State Building itself is celebrating!

On Friday, the building will be "illuminated with thousands of white lights sparkling in honor of the film’s anniversary. It was on that date in 1964 when Warhol trained his camera on the iconic landmark for six and a half hours, declaring, 'The Empire State Building is a star!'"

There is also a special exhibition inside the building through July 31st, where the film is being "continuously shown in the Empire State Building’s Fifth Avenue Lobby windows, accompanied by images of Warhol’s art and details of his life and filmmaking."

Warhol shot this film from the 41st floor of the Time-Life Building, from the offices of the Rockefeller Foundation—while he directed, Jonas Mekas served as cinematographer. You can watch some of it below: