Harmony Historic District, also known as Secular Harmony Historic District, is a national National Historic Landmark District located along Pennsylvania Route 68 at Harmony, Butler County, Pennsylvania. USA. It is the site of the first settlement established by the Harmony Society when they immigrated to the United States around 1804. The district includes 10 contributing buildings and 1 contributing site in Harmony. They include the Great House or Bentle Building (c. 1811), Langenbacher House (c. 1805), Harmonist Church (1808), The "Stohr," Beam Hotel, Frederick Rapp House, Schmitt House, Schreiber House, Wagner House, and Mueller House. The contributing site is the Harmonist Cemetery containing the unmarked graves of 100 early Harmonists.