This 100-year-old-plus courthouse was placed on the National Register of Historic Places in 1971. Ingham County is the only county in the United States in which the capital is not located in its county seat. The capital is located in Lansing, while its county seat is located in Mason. Open Mon.-Fri. 8 am –noon, 1–5 pm. No tours available on Wed. Admission: free. Please call ahead to schedule group tours.