It covers an area two blocks wide, extending north from German Road to Conoquenessing Creek between Liberty and Wood Streets.

The area retains a number of buildings dating to the original settlement period, and was designated a National Historic Landmark District in 1974.

Meeting with opposition from the dominant Lutheran Church, Rapp and his followers emigrated to North America, and purchased the land in Butler County where the community of 200 families founded Harmony in 1805.

The utopian community was run as a communist theocracy, with Rapp and later his son as its leading figure.

[3] The surviving elements of the early Harmonist settlement include a grid of streets in the heart of the modern town of Harmony, and a number of primarily brick buildings in that area.