The Foundation operates four historic house museums, including the 1858 Greek Revival style Earle-Napier-Kinnard House, the 1877 Italianate Villa East Terrace, the 1868 Greek Revival Style Fort House, and the 1866 McCulloch House. Fort House Museum displays exhibits from the Heritage Collection of textiles, garments, and accessories; and the other homes display seasonal vignettes from the collection. The Foundation itself is housed in the 1890s Queen-Anne-style Victorian Hoffman House.

The houses offer tours, exhibits, lectures, workshops, and other educational and recreational programs.

The Highlands Mansion and Gardens is a 44-acre historic site with a late-18th-century Georgian mansion and two-acre formal garden. Surrounded by massive stone walls, the gardens offer an example of early-20th-century estate gardening with an unusual blend of horticulture and architecture. The site features nine outbuildings, including a bank barn, springhouse, greenhouse, smokehouse, and Gothic Revival gardener's cottage.

The mansion offers tours and educational and recreational programs.

The Titan Missile Museum is the only publicly accessible Titan II missile site in the nation. Visitors can tour the underground missile site and see the 3-ton blast doors, the 8-foot-thick silo walls, and an actual Titan II missile in the launch duct. They can also visit the launch control center and experience a simulated launch.

The museum offers tours and educational and recreational programs.

At the Museum, visitors can experience hands-on history displays on naval aviation and see more than 150 restored aircraft representing Navy, Marine Corps and Coast Guard aviation. They can feel the sensations of flight in a flight simulator or visit the Naval Aviation Memorial Theater and view an IMAX film.

The museum offers exhibits, tours, film screenings, and educational and recreational programs.

The Society maintains the 1826 Fire Island Lighthouse, which still remains an active aid to navigation. Experienced staff guide visitors around the site, which provides panoramic views of the Atlantic Ocean, the Great South Bay, Fire Island, Long Island, and the Manhattan Skyline; exhibits are also displayed in the space.

The society offers exhibits and tours.

The Society maintains the 1898 Newland House, the oldest residence built in the city of Huntington Beach, as a museum.

The museum offers tours.

Established in 1955, the New Bern Firemen's Museum seeks to preserve the history of firefighting in New Bern. The exhibits are original pieces of equipment from the city's past. New Bern was the first city in North Carolina to charter a fire company, and one of the first in the nation; and the city's firefighters hold many world records.

The museum offers exhibits.

The Museum seeks to preserve and share with the public the history of railroading, particularly Texas railroading, as it has been and as it is now. The museum, open every weekend from April to November, features a collection of railroad locomotives, cars, and other artifacts, as well as a model railroad and a research library.

The museum offers exhibits and research library access.

With 16 historic buildings in its main complex, which occupies most of a square block in downtown Decorah, Iowa, and two National Register sites just outside the city, Vesterheim houses over 24,000 artifacts, which include large samplings from the fine, decorative, and folk arts, and the tools and machinery of early agriculture, lumbering, and other immigrant industries. Vesterheim also acts as a cultural center dedicated to preserving living traditions by offering classes in Norwegian folk art and culture, Elderhostels, and special programs for preschool, elementary, secondary, and college students.

The museums offers exhibits, classes, tours, research library access, and other educational and recreational programs.

Built in 1880 in Grand Rapids, Michigan, on the bank of the Grand River, Engine House No. 5 served the community with a horse-drawn steam pumper and a hose cart. The Engine House has since been moved and restored; and today, it houses firefighting equipment and memorabilia.

The museum offers exhibits and tours.