Rockefeller Archive Center on Instagram: "Millions of people visit Rockefeller Center every winter to see it decorated for the holidays. The tradition of putting up a tree actually began in 1931 with a tree purchased, set up, and decorated by construction workers building the site. This video clip from the Rockefeller family papers shows construction happening at Rockefeller Center. Employees just like this (though perhaps not these exactly) started the now-beloved tradition! Video: Rockefeller