Owner: City of McHenry. Petersen Farm. Now considered an historic treasure, under the protection of the McHenry Landmark Commission and the City of McHenry, the farmstead is being restored as part of the Petersen family will to create a living museum of 19th and 20th century farm life.Page Colby settled the land in 1842. Colby's granddaughter, Caroline, married Christian Petersen, and the farm has been linked with the Petersen name ever since. Features a Greek Revival house.