Haskell Free Library and Opera House - Credit: Wikimedia Commons
The Haskell Free Library and Opera House () is a Victorian building that straddles the Canada–United States border, in Rock Island (now part of Stanstead), Quebec, and Derby Line, Vermont, respectively. The Opera House opened on June 7, 1904, having deliberately been built on the international border. It was declared a heritage building by both countries in the 1970s and 1980s. Read more on Wikipedia
Source: en.wikipedia.org