The New York City Department of Records – the source for four centuries of municipal government history and information. You can access the collections of the New York City Municipal Archives and Library on Saturdays between the hours of 9:30 a.m. and 12:30 p.m. Or visit the "Unlikely Historians" exhibit of NYPD surveillance materials. We also are open on Thursdays until 7 p.m. You can access the collections of the New York City Municipal Archives and Library on Saturdays between the hours of 9:30 a.m. and 12:30 p.m. Or visit the "Unlikely Historians" exhibit of NYPD surveillance materials. We also are open on Thursdays until 7 p.m.