McHenry Cty Historical Society — The Museum is open regularly May through October, with special events scheduled in October - December. See their Calendar for more information.Visiting hours are 1 to 4 p.m. Tuesday through Friday, as well as 1 to 4 p.m. on limited Sundays as shown on our calendar. Admission charge for non-members. Adults - $5.00,, Seniors (60+) and Students - $3.00, and Family Rate (Includes 2 family member adults and 2 or more children) - $12.00.