The Charles H. Hibbard House, in the McHenry County city of Marengo, Illinois, has been listed on the National Register of Historic Places since 1979. The home, also known as the Cupola House. The home is a distinctive example of Italianate architecture. The home's namesake as Cupola House comes from the octagonal cupola on its roof which provides ventilation and it is thought served as a lookout tower during the Civil War.

The first floor has two back bedrooms believed to have been servant's quarters at one time. During the Civil War it is thought that the home was used as a safe stop for runaway slaves. The cupola played a key role in that if it was safe to stop, for food and lodging, a light would be hung in the cupola window. The home also contained a secret, underground room in the yard, it had a hidden entrance near the front porch.Upstairs, on the second floor, there are six bedrooms, a long hallway, a back staircase and bathroom. Construction began in 1846 at the behest of Charles Hibbard, in 1847 the home was complete and the Hibbard's moved in. The home was constructed as an exact replica of Hibbard's childhood home and contains 14 rooms. Construction cost somewhere around $16,000.