Terrace Hill, also known as Hubbell Mansion, Benjamin F. Allen House or the Iowa Governor's Mansion, is the official residence of the governor of Iowa, United States. Located at 2300 Grand Avenue in Des Moines, it is an example of Second Empire architecture. The home measures 18,000 square feet. It sits on a hill overlooking downtown Des Moines, and has a 90-foot (27 m) tower that offers a commanding view of the city. The building's steeply pitched mansard roof, open verandas, long and narrow and frequently paired windows, and bracketed eaves give this house an irreplaceable design. The house was designated a National Historic Landmark in 2003.

Des Moines is the capital and most populous city in the U.S. state of Iowa. It is the county seat of Polk County with parts extending into Warren County. It was incorporated on September 22, 1851, as Fort Des Moines, which was shortened to "Des Moines" in 1857. It is located on, and named after, the Des Moines River, which likely was adapted from the early French name, Rivière des Moines, meaning "River of the Monks". The city's population was 214,133 as of the 2020 census. The six-county metropolitan area is ranked 81st in terms of population in the United States, with 709,466 residents according to the 2020 census by the United States Census Bureau, and is the largest metropolitan area fully located within the state.