Charles E. Simons Jr. Federal Court House

The Old Aiken Post Office, located in Aiken, South Carolina, is a former United States Post Office and photography studio that now serves as an office building. The first floor of the building has been occupied by Savannah River Nuclear Solutions, LLC since December 2009 following renovations.The building was originally proposed by U.S. Representative George W. Croft in 1904. After Croft's death, his son, U.S. Representative Theodore G. Croft, continued the project. Over the years, the building has been occupied by numerous politicians, including U.S. Senator Strom Thurmond and South Carolina Senator Tom Young.

The Battle of Aiken (also known as the Action at Aiken) occurred on February 11, 1865 and was part of the Carolinas campaign. The principal commanders were Union Maj. Gen. Hugh Judson Kilpatrick and Confederate Maj. Gen. Joseph Wheeler. Wheeler was able to score a minor victory over Kilpatrick. Today, an annual re-enactment is held the final full weekend in February. As of May 2022, 28 reenactments of Aiken have been held.

The Aiken Tennis Club is a private court tennis club located at 146 Newberry Street, SW in Aiken, South Carolina. It includes the Court Tennis Building. The club was incorporated in 1898 with the sponsorship of financier and founder of the prominent Whitney family, William C. Whitney. The building was constructed around 1902 and listed on the National Register of Historic Places on November 27, 1984. The Aiken Tennis Club is the world's most equatorial court tennis (also known as "real tennis") venue, and one of only two American courts south of the Mason-Dixon line (the other is the International Tennis Club of Washington). Former world champions who have played on the court include Northrup R. Knox, G.H. "Pete" Bostwick, Jr., Jordan Toole, Jimmy Bostwick, Wayne Davies, Robert Fahey, and Camden Riviere. The most notable competition was the world championship challenger match between Ruaraidh Gunn and Camden Riviere on March 8, 2008.

Willcox's, located in Aiken, South Carolina, US, was an internationally known inn during the Aiken Winter Colony heyday. Operated from 1898 to 1957 by members of the Willcox family, the still-magnificent building reflects the influence of both Second Empire and Colonial Revival styles of architecture. The plan of the building is irregular in shape, consisting of a central block with asymmetrical wings. Of Aiken's once famous resort hostelries, only Willcox's is still standing. The landmark property was listed on the National Register of Historic Places March 19, 1982.

The Legare-Morgan House is a one-story clapboard structure built in Aiken, South Carolina around 1835. From 1850 to 1859 it was the home of the artist, poet and inventor, James Mathews Legare. In 1870 the property was sold to Thomas C. Morgan. The home, located in proximity to Aiken's downtown area, was listed on the National Register of Historic Places September 22, 1977.

St. Thaddeus Episcopal Church is parish of the Episcopal Church in Aiken, South Carolina. It is noted for its historic church at Pendleton and Richland Streets.Aiken is a planned community, and land for the church had been set aside in the original plan by the South Carolina Canal and Railroad Company. The cornerstone for the original church was laid September 5, 1842. This building was subsequently renovated and expanded over the years, and additional buildings added to the campus. The church was added to the National Register of Historic Places in 1984.

St. Mary Help of Christians Church is a Catholic parish of the Roman Catholic Diocese of Charleston. The main parish church is at 138 Fairfield St. SE in Aiken, South Carolina. The campus also includes the historic 1905 church ("Old Saint Mary's") at the corner of Park Avenue and York Street, and Ste. Claire Chapel (1880), which sits to the left of the historic church. These two church buildings are listed on the National Register of Historic Places

Aiken Winter Colony Historic District II, located in Aiken, South Carolina. It is one of the three districts associated with the Aiken Winter Colony. This district, with over 100 properties, has approximately three times as many structures as Historic District I. District II also offers a number of impressive residences and outbuildings, as well the famous inn, Wilcox's.” The properties were constructed between 1880 and 1930. This visually appealing district was placed in the National Register of Historic Places on November 27, 1984.

Joye Cottage is one of the oldest, and largest winter retreats in Aiken, South Carolina. Most of the sprawling property dates to 1897, when William Collins Whitney purchased the property and remodeled it extensively. It now includes a main house, a stable, a greenhouse, a laundry house, a couple of one-story cottages, and a squash court. The property was listed on the National Register of Historic Places in 1980.

Chinaberry, also known as Williams-Converse House, is a house in Aiken, South Carolina that was built in 1824. It was listed on the National Register of Historic Places in 1982.A skirmish in the Civil War occurred in the front yard of the property.

Immanuel School is significant for its association with the area's parochial education of African-American children in the Aiken, South Carolina, (USA), area from 1890 to 1932. It was listed on the National Register of Historic Places in 2009.

Aiken Winter Colony Historic District III, located in Aiken, South Carolina. It has 42 properties, most of which were seasonal residences. The pleasing district varies from small cottages to large estates. Architectural styles include Queen Anne, Victorian, Colonial Revival, and Classical Revival, among others. The district also includes the Aiken Preparatory School. Aiken Winter Colony Historic District III was listed in the National Register of Historic Places on November 27, 1984.