[PAR] [TLE] Haskell Free Library and Opera House [SEP] The Haskell Free Library and Opera House (French: Bibliothèque et salle d'opéra Haskell) is a neoclassical building that straddles the international border in Rock Island (now part of Stanstead), Quebec and Derby Line, Vermont.  The Opera House opened on June 7, 1904, and was deliberately built on the border between Canada and the United States.  It was declared a heritage building by both countries in the 1970s. [PAR] [TLE] Line house [SEP] A line house is a building deliberately located so that an international boundary passes through it.  The term is perhaps more frequently used in reference to the boundary between New England and eastern Canada than to other places.  The most well known such building on the boundary between the United States and Canada is the Haskell Free Library and Opera House in Stanstead, Quebec and Derby Line, Vermont.  The border is marked on the floor in a reading room and an auditorium.  A number of single-family residences and some industrial buildings straddle the boundary in those two towns.
[PAR] [TLE] Haskell Free Library and Opera House [ SEP ] The Haskell Free Library and Opera House ( French : Bibliothèque et salle d'opéra Haskell ) is a neoclassical building that straddles the international border in Rock Island ( now part of Stanstead ) , Quebec and Derby Line , Vermont . The Opera House opened on June 7 , 1904 , and was deliberately built on the border between Canada and the United States . It was declared a heritage building by both countries in the 1970s . [PAR] [TLE] Line house [ SEP ] A line house is a building deliberately located so that an international boundary passes through it . The term is perhaps more frequently used in reference to the boundary between New England and eastern Canada than to other places . The most well known such building on the boundary between the United States and Canada is the Haskell Free Library and Opera House in Stanstead , Quebec and Derby Line , Vermont . The border is marked on the floor in a reading room and an auditorium . A number of single - family residences and some industrial buildings straddle the boundary in those two towns .
What era was the well known buliding on the border of United States and Canada declared a heritage building by both?
What era was the well known buliding on the border of United States and Canada declared a heritage building by both ?
It was declared a heritage building by both countries in the 1970s.
It was declared a heritage building by both countries in the 1970s.