Tours of Messer/Mayer Mill, House, outbuildings, and other structures located in the Richfield Historical Park will be open for tours in 2010 on the dates listed below. However, tours can be scheduled between April 15 and November 15 by appointment. Call 262-628-2841. The price of the tour is $5.00 per person or $3.00 per person for groups of 25 or more.