The Robert Waugh House, also known as the Sparland Octagonal House, is located in the Marshall County

Marshall County, Illinois

The median income for a household in the county was $41,576, and the median income for a family was $48,061. Males had a median income of $35,765 versus $21,452 for females. The per capita income for the county was $19,065...

 village of Sparland, Illinois

Sparland, Illinois

Sparland is a village in Marshall County, Illinois, United States. The population was 504 at the 2000 census. It is part of the Peoria, Illinois Metropolitan Statistical Area.-Geography:...

, on a steep hillside overlooking the Illinois River

Illinois River

The Illinois River is a principal tributary of the Mississippi River, approximately long, in the State of Illinois. The river drains a large section of central Illinois, with a drainage basin of . This river was important among Native Americans and early French traders as the principal water route...

. The house has been listed on the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

since October 1978. The house was built by Robert Waugh, on land purchased for the sum of 25 dollars. It is the only site in Marshall County listed in the Register. It is a private house and has "pie-shaped rooms around a central spiral staircase".