The Langworthy House, also known as the Octagon House, is an historic octagon house

Octagon house

Octagon houses were a unique house style briefly popular in the 1850s in the United States and Canada. They are characterised by an octagonal plan, and often feature a flat roof and a veranda all round...

 located at 1095 W. 3rd Street in Dubuque

Dubuque, Iowa

Dubuque is a city in and the county seat of Dubuque County, Iowa, United States, located along the Mississippi River. In 2010 its population was 57,637, making it the ninth-largest city in the state and the county's population was 93,653....

, Iowa

Iowa

Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...

. Built in 1856, it was designed by local architect John Francis Rague for local politician Edward Langworthy. The two-story brick home features tall windows, a columned entry, and a windowed cupola.

On October 14, 1975, it was added to 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...

.