The former Old Stone Church, also known as Calvary Episcopal Chapel, is an historic stone Late Gothic Revival-style Episcopal church building located at 206 North Wilcox Avenue in Buffalo, North Dakota.

In 1985, the Masons donated it to the Buffalo Historical Society, which 10 years later restored it.

[2][3] On March 29, 1996, the Old Stone Church was added to the National Register of Historic Places.

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