The Mansion was the home of philanthropist, railroad magnate, and founder of Lehigh University, Asa Packer. Built in 1861 by Philadelphia architect, Samuel Sloan, the home was constructed over a span of two years and cost a total of $14,000 dollars, the equivalent of $2.3 million dollars today. Topped by a red-ribbed tin roof and a central cupola or belvedere, the home was built over a cast-iron frame and consists of three stories, 18 rooms and approximately 11,000 square feet of living space.

The museum offers tours and occasional recreational and educational events.

Completed in 1851, this National Historic Landmark is a museum of state history and politics. Additions to the building were made several times. The Confederacy began in the original Senate chamber and the Selma to Montgomery 1965 Voting Rights March ended on the street in front of the building. Today, the governor and other executive branch officers still occupy offices in the Capitol.

The site offers exhibits and tours.

The Society owns and operates two historic sites. The 1885 Pottawattamie County Squirrel Cage Jail is one of 18 revolving ("squirrel cage," "human rotary," or "lazy Susan") jails built. The RailsWest History Center, housed in the 1899 Rock Island Depot, has displays of dining car silverware, a telegraph office, and memorabilia such as porters' uniforms and ticket stubs, as well as railcars and a model railroad.

The sites offer tours and exhibits; the society offers lectures and educational and recreational programs.

The National Railroad Museum, built in 1958, strives to introduce visitors to a chapter in American history that bought wealth and modernity to millions of Americans. The Museum looks beyond the simple technical history of rail to the cultural and economic changes it brought to America.

The site offers virtual tours, event and museum information, teacher resources, and an online gift shop.

Weeksville Heritage Center is dedicated to preserving the Hunterfly Road houses. These houses represent one of the first free African American community in the United States. In 2005, the houses underwent a three million dollar restoration, and now sit in a park in central Brooklyn, similar to their original setting. A new education/cultural center is being built now.

The site offers information about historical Weeksville, an archive of press releases, and information about upcoming events.

The Naper Settlement's living history museum tells the story of daily life in Naperville as it changed from a simple frontier outpost to a bustling turn-of-the-century community.

The settlement offers exhibits, tours, demonstrations, research library access, educational programs, and recreational and educational events (including living history events). The website offers information about the history of Naper settlement as well as current information for visitors.

Constitution Island is part of West Point, the United States Military Academy, a National Registered Landmark. The Island is most famous for the Great Chain that was placed across the Hudson during the Revolutionary War and the Warner family who lived on the Island during the 19th century. The Warner House and ruins of the Revolutionary War fortifications are the primary points of interest.

The site offers tours and occasional recreational and educational events (including living history events).

The National Capital Trolley Museum preserves and interprets the heritage of electric and interurban railways of Washington, D.C. and environs for the benefit of present and future generations, while supplementing its collections with significant national and international objects to enhance its interpretive programs.

The museum offers exhibits, street car rides, educational programs, and occasional recreational and educational events.

Built in 1885, the original Opera House burned down in the 1892 fire that destroyed much of downtown Woodland. It was rebuilt on the same site, using some of the remaining foundations and bricks from the walls, reopening in 1896. Today, the interior of the Opera House has been painstakingly restored to the grandeur it enjoyed at the turn if the century. Careful attention was paid to reproduction of the wallpaper friezes, paint colors, and carpeting. The main floor carpet was manufactured in England and shipped to the Opera House for installation. Comfortable main floor theater seating was built on the East Coast for installation and the historic pew-like benches in the balcony area were repaired or carefully replaced.

A second, individual website for the Opera House can be found here.

The park offers tours and year-round performances, productions, classes, and workshops.

The Society is housed in the Jonathan Bourne Historical Center, built in 1897 by Emily Howland Bourne as a town library and as a memorial to her father, Jonathan Bourne, for whom the town was named. The Society also manages the Aptucxet Trading Post and the Briggs-McDermott House. The Trading Post recreates the first trade house built in 1627, by Plymouth Colony, located on the south bank of the Manomet (Monument) River, which is now part of the Cape Cod Canal. The Pilgrims traded with the Indians and the Dutch from New Amsterdam (New York City), thus having a source of income by which their debt to the London backers of their expedition to the New World could be repaid. The Trading Post site also houses Gray Gables Railroad Station, built for the personal use of President Grover Cleveland during the years of his presidency (1893–1896). The Greek Revival-style Briggs-McDermott House has been restored and furnished to reflect the period from 1840 to 1910, an important time for the Briggs family and Bourne.

The society offers lectures and occasional recreational and educational events; the center offers tours, exhibits, and research library access; the Trading Post offers tours; the Briggs-McDermott House offers exhibits and tours.