"It took New York City’s Metropolitan Museum of Art (the Met), founded in 1870, a remarkable twenty-one years to convince its board of trustees to open the museum to the public on Sunday… On May 19, 1891, the issue was finally addressed during a three-hour meeting of the Met’s board. At this boisterous gathering, described as a 'series of cloudbursts,' a sharply divided board passed the following resolution: 'Resolved, that… the museum be opened free to the public every Sunday from 1 P.M. till half an hour before sunset.' A gentleman representing the World attended the meeting with a check in hand to help offset the additional costs of opening on the extra day. Later the World’s headline proclaimed, 'THE PEOPLE TRIUMPH.' The New York Times trumpeted, 'VICTORY IS WON AT LAST.' …More than a century later, in 2007 the Met’s Visitor’s Service Department reported an average Sunday attendance of between 16,000 and 18,000, with a peak of 40,000 visitors on one Sunday during the Christmas holidays. Whatever may be said about the individual motives of the Met’s founders, it is clear that they did the right thing."
For more on the history of the Met, check out this article by Jerri Sherman in Gotham: A Blog for Scholars of New York City History.