The Medfield Historical Society is holding tours of the Peak House weekly through Sept. 15. The tours are held each Sunday between 2 and 5 p.m. According to the society, the Peak House is believed to have been built in 1711 by Benjamin Clark for his youngest son, Seth. The house is less than 400 square feet, but has three levels and a basement and at one time housed nine people. It is the only freestanding structure like it in the United States, and is one of the earliest surviving homes of post-medieval English architecture in the country, according to the society. More information is available on the society’s website, at www.medfieldhistoricalsociety.org.