The Butler County Courthouse is located in Hamilton, Ohio and was constructed from 1885–1889 by architect David W. Gibbs. The courthouse is a registered historic building listed in the National Register on June 22, 1981.
German Village Historic District is a registered historic district in Hamilton, Ohio, listed in the National Register of Historic Places on February 7, 1991. It contains 177 contributing buildings.
The Lane–Hooven House is a historic house museum in Hamilton, Ohio. Built in 1863 for Clark Lane, a Hamilton industrialist and philanthropist, the octagonal house features a brick exterior with Gothic Tudor elements. Other features include an open spiral staircase extending from the basement to the third floor turret, cast-iron fence, a greenhouse and a fountain. It was listed in the National Register on October 25, 1973.
The Newark Earthworks in Newark and Heath, Ohio, consist of three sections of preserved earthworks: the Great Circle Earthworks, the Octagon Earthworks, and the Wright Earthworks. This complex, built by the Hopewell culture between 100 BCE and 400 CE, contains the largest earthen enclosures in the world, and was about 3,000 acres in total extent. Less than 10 percent of the total site has been preserved since European-American settlement; this area contains a total of 206 acres (83 ha). Newark's Octagon and Great Circle Earthworks are managed by the Ohio History Connection. A designated National Historic Landmark, in 2006 the Newark Earthworks was also designated as the "official prehistoric monument of the State of Ohio."
The Zimmerman House is a house museum in the North End neighborhood of Manchester, New Hampshire. Built in 1951, it is the first of two houses in New Hampshire designed by Frank Lloyd Wright, and one of a modest number of Wright designs in the northeastern United States. The house was built for Dr. Isadore Zimmerman and his wife Lucille. The house is now owned by the Currier Museum of Art because of the Zimmermans' decision to donate the home to the public after their death. The museum provides tours of the building, which is the only legal access to the grounds. It was listed on the National Register of Historic Places in 1979.
The Clarence Darrow Octagon House is a historic octagon house in the community of Kinsman, Ohio, United States. Home to lawyer Clarence Darrow in his childhood, it has been named a historic site.
The Octagon is a historic octagon house on the campus of Heidelberg University in Tiffin, Ohio, United States. Built in the mid-19th century, it has been used for residential purposes throughout its history, and while it has experienced over a century of gradual deterioration, it has been named a historic site, and the 21st century has seen plans to restore it to its original integrity.
The David Cummins Octagon House is an historic octagon house located at 301 Liberty Street in Conneaut, Ohio. Built sometime in the 1860s, it is named for David Cummins, who founded the Cummins Canning Company in Conneaut. Because the house had a tunnel running from it to the nearby Conneaut Creek, it has been said that the house was a station on the Underground Railroad, but this has been questioned and it has been suggested that the tunnel belonged instead to a previous house located on the property.
The Octagon House is a historic octagon house in Reading, Massachusetts. Built in 1860 by Doctor Horace Wakefield, it is a distinctive variant of the type, executed as a series of small octagonal shapes around a central cupola. The building is fashioned from large, heavy timbers in the manner of a log cabin, with long first-floor windows. The porches and eaves have heavy zigzag trim and brackets, some of which have carvings resembling gargoyles.
The William Bryant Octagon House is an historic octagon house located at 2 Spring Street in Stoneham, Massachusetts. Built in 1850, it is the best-preserved of three such houses built in the town in the 1850s. It was listed on the National Register of Historic Places in 1984.
The Charles Butler House is a historic octagon house in the city of Franklin, Ohio, United States. Constructed during the middle of the nineteenth century, it was originally home to one of the city's most prominent men, and it has been named a historic site due to its unusual design.
The John Hosford House is a historic octagon house located along U.S. Route 20 in Monroeville, Ohio, United States. Built at an unknown point in the mid-nineteenth century, it has been named a historic site.
The Gregg-Crites house, also known as the M. M. Crites house, is an octagon house located in Circleville, Ohio, on Route 23 just south of town. It was built by George Gregg between 1855 and 1856 and now owned by The Roundtown Conservancy. It was listed on the National Register of Historic Places in 2021.
The Zimmerman Kame is a glacial kame and archaeological site in McDonald Township, Hardin County, Ohio, United States, near the community of Roundhead. A circular hill approximately 20 feet (6.1 m) in height, it was a commercial gravel pit for a time before being abandoned in the 1970s after artifacts of the ancient Glacial Kame culture of Native Americans were found at the site. Today, the kame is tree-covered and surrounded by farm fields; there are no obvious signs of its significance.
This is a list of the National Register of Historic Places listings in Hardin County, Ohio.
St. Nicholas Catholic Church is a historic Roman Catholic church in Osgood, Ohio, United States. Built in the first years of the 20th century, it houses one of the newest parishes in a heavily Catholic region of far western Ohio, but it has been recognized as a historic site for its architecture.
Elm Hill, also known as the Campbell-Bloch House, is a historic house and national historic district located near Wheeling, Ohio County, West Virginia. The district includes two contributing buildings and one contributing site. The main house was built about 1850, and is a 2+1⁄2-story, brick house with a low 2-story wing in the Greek Revival style. It has an L-shaped plan, a 3-bay entrance portico, and hipped roof with an octagonal bell-cast central cupola. The interior has a central formal hall plan. Also on the property are a contributing brick, spring house / smoke house and a small cemetery dating to about 1835.
The Edward Kirk Warren House and Garage is a historic house located at 2829-2831 Sheridan Place in Evanston, Illinois. The house was built in 1910-12 for Edward Kirk Warren, an industrialist who developed the featherbone corset. Warren also served as president of the International Sunday School Association and provided financial support to evangelist Dwight L. Moody. Architect William Carbys Zimmerman, the Illinois State Architect at the time, designed the Tudor Revival house. The house was built from dressed ashlar, an uncommon building material for Tudor Revival houses; it is one of only two ashlar Tudor Revival houses in Evanston. The house's roof has a steep main gable with a parapet along with several smaller gables and dormers with a similar design. The entrance porch is supported by columns and covered by an overhang with bracketed eaves. An octagonal tower with ornamental griffins and a crenellated battlement rises to the left of the entrance. Other decorative features used in the exterior include stained glass, arched windows, and various patterns inlaid in the stone.
The 18th & E. Broad Historic District is a historic district on Broad Street in the Near East Side of Columbus, Ohio. The district was added to the Columbus Register of Historic Properties in 1988. Its properties were added to the E. Broad St. Multiple Resources Area on the National Register of Historic Places in 1986.
The Heyne-Zimmerman House is a historic house in Columbus, Ohio, United States. The house was built c. 1912 and was listed on the National Register of Historic Places in 1987. The Heyne-Zimmerman House was built at a time when East Broad Street was a tree-lined avenue featuring the most ornate houses in Columbus; the house reflects the character of the area at the time. The building is also part of the 18th & E. Broad Historic District on the Columbus Register of Historic Properties, added to the register in 1988.
