Question: In which year was the historic house and museum that the Maine Historical Society operates from designated as a National Historic Landmark?
Sentence (from "Maine Historical Society"): The Society currently operates the Wadsworth-Longfellow House, a National Historic Landmark, Longfellow Garden, the Maine Historical Society Museum and Store, the Brown Research Library, as well as the Maine Memory Network, an online database of documents and images that includes resources from many of state's local historical societies.
Relevant evidence: Yes