The Haskell Free Library and Opera House straddles the Canada–United States border. Its library and stage are in Stanstead, Quebec, while its main entrance and most theater seats are in Derby Line, Vermont. Architect James Ball designed it in the Queen Anne Revival style. Construction began in 1901. The opera house opened on June 7, 1904, and the library followed in 1905. Martha M. Haskell and her son, Horace Stewart Haskell, gave the building in memory of family members.
The opera hall on the second floor seats about 400. It has a painted drop curtain depicting Venice. The walls are two feet thick and made of Stanstead granite. A black line marks the border across the public spaces.
The library holds more than 20,000 books in English and French. The building is a Canadian National Historic Site.
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