Nemours is the 300-acre country estate of the late industrialist and philanthropist Alfred I. duPont. The mansion was built from 1909 to 1910 and is a fine example of a French chateau in the style of Louis XVI. The 47,000-sq.-ft. mansion looms over the surrounding formal gardens and is furnished with fine antiques, famous works of art, beautiful tapestries, and other treasures. The grounds surrounding the mansion extend for one third of a mile along the main vista from the house, and are among the finest examples of French-style gardens in the United States.

The mansion offers tours.

The Society owns and maintains several historical sites, including the 1742 Square Tavern, the 1860 Bartram Bridge, and the Paper Mill House Museum. This building provided housing, beginning in the 1770s, for industrial workers who worked in the mills along Darby Creek. A large addition was added circa 1820. The older section was converted to a general store, circa 1845, to provide for the needs of the workers. Darby Creek runs through the property to the east of the building. The building, now owned by Newtown Township, has been restored to house permanent historical exhibits.

The society offers tours and recreational and educational events; the museum offers exhibits and tours.

A restored boarding house with two floors of interactive exhibits tells the tale of Lawrence, one of the nation's first planned industrial cities. Along with stories of Lawrence's mill workers and industry, the workers' role in the 1912 Bread and Roses Strike is relived with images and sounds. Visitors can walk along the esplanade of a 19th-century canal and through a park created within the walls of an industrial-era building.

The park offers exhibits, tours, a short film, and educational and recreational programs.

Organized in 1925, the mission of the Lake County Historical Society is to preserve the history of Lake County, MN, through the preservation, study and interpretation of artifacts, documents, photographs, and historic sites. The Society also maintains several historic sites. The Two Harbors Light Station constructed in 1892 is the oldest operating light station in Minnesota and is listed on the National Register of Historic Places. The lighthouse museum explores the development of Agate Bay. The 3M Museum includes the original office and headquarters of Minnesota Mining and Manufacturing (3M). It was here, in 1902, that five businessmen embarked on a mining venture which laid the foundation for a successful global corporation. Exhibits include Attorney John Dwan's recreated office; a history of the company including photos, artifacts, and documents; a "lab" area representing research and development, product diversification, and growth; and a "hands on" interactive program of technology applications. The Depot Museum is in the 1907 headquarters of the Duluth and Iron Range Railroad, and highlights the early pioneering history of Lake County. Exhibits range from McDougal archaeological dig artifacts and a Paleo-Indian display to the first shipment of iron ore from Minnesota.

The Two Harbors Light Station offers exhibits and tours; the 3M Museum offers exhibits; and the Depot Museum offers short films and exhibits.

The Seneca Museum celebrates historic Seneca Falls, Seneca County, and the Finger Lakes region of central New York State. The Museum illustrates how the Seneca River and the Cayuga-Seneca Canal powered the rise of industry and fostered cultural development, helping to spread social reform movements.

The museum offers exhibits and educational and recreational programs and events.

A walk through historic Greenwood Furnace evokes images of the community that flourished here from 1834 to 1904. Greenwood Furnace was a busy industrial complex, with all the noise and dirt of a 19th-century ironmaking community. Today, the park covers 423 acres, including a six-acre lake, and is surrounded by an 80,000-acre block of Rothrock State Forest. Interpretive programming at the park is centered on the former Greenwood Furnace and the company town that grew up around it.

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

In one of Maryland's first state parks (1907), the valley and its natural resources have been enjoyed by the Native Americans, explorers, settlers, and present-day citizens. With its source in Frederick and Carroll counties, the Patapsco serves the Port of Baltimore, and empties into the Chesapeake Bay. The Avalon Visitor Center houses exhibits spanning over 300 years of history along the Patapsco River. Housed in a 19th-century stone dwelling in the Avalon Area, the center includes a recreation of a 1930s forest warden's office. The park contains several historic sites, including the Baltimore and Ohio Railroad, the Thomas Viaduct, remains of the Orange Grove Mill, the Avalon Iron and Nail Works, and Bloedes Dam.

The park offers exhibits and tours.

The Center presents interpretative exhibits covering the entire history of the Columbia Gorge, from prehistory to the present day, including First Peoples, the Lewis and Clark Expedition, forts and settlements in the area, timber and fishing industries, transportation up and down the river, and other historical topics.

The center offers a short film, exhibits, and educational programs.

Created by Congress in 1996, the Rivers of Steel National Heritage Area is committed to preserving, interpreting, and managing the historic, cultural, and natural resources related to Big Steel and its related industries. Encompassing over 5,000 square miles in the seven counties of Allegheny, Armstrong, Beaver, Westmoreland, Greene, Fayette, and Washington, Rivers of Steel is building on this area's remarkable transition from heavy industry to high technology and diversified services as well as bolstering the new regional economy by promoting tourism and economic development based on this region's historic industrial saga.

A multifaceted program, the Rivers of Steel National Heritage Area's mission includes: historic preservation, cultural conservation, education, recreation, and resource development. Currently, the Heritage Area has bills in Congress to create the Homestead Works National Park. The proposed park would be located on 38 acres surrounding the Carrie Furnaces, the last of the giant blast furnaces from the Homestead Works, and the Pump House, site of the bloody 1892 Homestead Steel Strike.

River of Steel also maintains the Bost Building, an 1892 hotel, in which it presents exhibits.

The Bost Building offers exhibits and educational programs.