The Foundation operates two historical sites, Historic Kenmore and Ferry Farm. Built by George Washington's sister, Betty Washington Lewis and her husband Fielding Lewis, Kenmore, a 1775 Georgian-style mansion, reflects the pre-Revolutionary War wealth and status of the Fredericksburg merchant. Lewis lost his fortune due to his patriotic support of the war but the house he built remains. Ferry Farm is the boyhood home of George Washington. Augustine Washington moved his family to this property in 1738, when his son, George, was six years old. George received his formal education during his years here, and forged friendships in the neighborhood that lasted the rest of his life. In 1754, George moved to Mount Vernon while his mother, Mary Ball Washington, stayed on at the farm until 1772, when she moved to Fredericksburg.

The foundation offers educational programs and occasional recreational and educational events (including living history events); Kenmore offers tours; Ferry Farm offers exhibits and tours.

A Hawaiian national treasure and the only official state residence of royalty in the United States, 'Iolani Palace was the official residence of the Hawaiian Kingdom's last two monarchs—King Kalakaua, who built the Palace in 1882, and his sister and successor, Queen Lili'uokalani. During the monarchy period, the Palace was the center of social and political activity in the Kingdom of Hawai'i.

The palace offers tours, exhibits, concerts, educational programs, other workshops and classes, and occasional educational and recreational events.

The Society operates the Collen Brook Farm, an 18th-century farmhouse, as a house museum.

The farm offers tours, educational programs, and occasional recreational and educational events.

In 1855, Colonel John Harris and his wife Henrietta built a two-story, all brick, Greek revival house "on a ridge just east of town." The home was known as the "Mansion House." Today, it houses the Society's headquarters and serves as a visitor center and house museum.

The society offers tours, educational programs, research library access, and occasional recreational and educational events; the house offers tours.

The Society operates the historic Kiersted House as its headquarters and museum. The Kiersted House is architecturally significant as an example of early-18th and 19th-century local building craft and practices. The original builder is still unknown, but the first recorded owner of the homestead was Hiskia Dubois in 1724, and it was purchased by Dr. Christopher Kiersted in 1773. The House displays changing exhibits on local history.

The society offers occasional recreational and educational events (including living history events); the museum offers exhibits.

The Lee-Fendall House is an excellent resource for teachers of American and local history. The history of the Lee-Fendall House began in 1784, when Revolutionary War hero “Light Horse Harry” Lee, father of Confederate General Robert E. Lee sold the property to his cousin, and follows our nation’s struggles and successes from its early years as a republic through the tumultuous Civil War years when convalescing Union soldiers were housed here and into the 20th century when labor leader John L. Lewis bought the house. A beautiful collection of Lee family heirlooms and other period pieces produced by Alexandria craftsmen help to tell the story of early Victorian family life in Old Town Alexandria, Virginia.

The house is open for tours where guests are able to explore the stunningly restored house and award-winning gardens. Special events and lectures are regularly scheduled. Youth and scout programs can be arranged.

Historic Ritzville maintains two museums. The Burroughs Home was the residence of Ritzville's pioneer physician, Dr. Frank R. Burroughs. It has been restored to its original condition and its collection highlights clothing and household items from the 1890s to the 1920s. The Depot features commercial artifacts relevant to Ritzville around the turn of the century. These include the town's original horse-drawn hearse and a working telegraph machine.

The Colonel Benjamin Stephenson House is a landmark that links the early history of Edwardsville to the earliest days of the Illinois Territory circa 1809 and the establishment of Edwardsville as the center of government and commerce. It is a connection between Territorial Governer Ninian Edwards, Colonel Benjamin Stephenson, and the State of Illinois. Built in 1820, this two-story brick home, constructed in the Federal style, is an excellent example of architecture from this early period. Each of the four rooms has original millwork; and two of the original mantels designed in the Adams style remain. The home was built with native material by skilled local craftsmen.

The house offers tours, educational programs, other workshops and classes, demonstrations, and occasional educational and recreational events.

William B. Ide was named president of the short-lived California Bear Republic—which lasted for 22 days. The adobe memorial to him is located in a picnic area overlooking the Sacramento River. The park features the old adobe home, carriage shed, blacksmith shop, and a small visitor center.

The park offers exhibits, tours, and occasional recreational and educational events.