Photo by Maike Schulz, courtesy The Green-Wood Historic Fund The historic Green-Wood Cemetery, in Brooklyn, is asking one simple question: Are you Mrs. Niblo? As the National Historic Landmark site prepares to host its summer spectacular, A Night at Niblo’s Garden, it seems the role of Mrs. Niblo has yet to be cast. Green-Wood is turning to social media and the hashtag #IAmMrsNiblo to find its missus from among its social media fans and followers. In era-appropriate dress, Mrs.