Central Insurance started out in 1876 as a fire insurance company. The threat of a disastrous fire was always very real and the equipment used to fight fire primitive. F. W. "Bill" Purmort, Jr., President of Central from 1964 to 1994, first took an interest in collecting fire equipment in 1969. He gradually built Central's museum into one of the finest privately owned collections in the U.S. The museum exhibits a collection of leather fire buckets dating back to the 1700s; over 600 antique fire toys consisting of cast-iron, rubber, glass, tin, and wood construction; a large display of fire extinguishers and glass fire "grenades" dating from the 1850s; a rare and valuable collection of "firemarks" dating back to 1720; a wardrobe of antique fireman helmets and uniforms; Van Wert's first hand-drawn pumper used in 1871; an Ahrens horse-drawn steam pumper which was purchased new in 1907 by the city of Van Wert and restored by Central; and a 1926 Ahrens-Fox pumper, the Rolls Royce of firetrucks.

The museum offers exhibits and tours.

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.

The Museum preserves the site on which Whitney constructed the first American factory in 1798. The Museum celebrates the Whitney tradition of learning by experiment. The Museum designs, produces and teaches projects that engage hands, eyes, and minds and that blend art, science, and invention.

The museum offers exhibits and educational programs, in which students learn about history and other subjects while making crafts and conducting experiments.

Darnall's Chance House Museum is dedicated to the interpretation and study of the history and culture of 18th-century Prince George's County, MD, with special emphasis on the lives of mid-18th-century women. The Museum interprets the story of the widow Lettice Wardrop Thomson Sim, who lived at Darnall's Chance in the decades just prior to the American Revolution. The house and grounds reflect 1760, the year Lettice Wardrop's first husband died and a room by room inventory was taken of the contents of the house. Darnall's Chance also strives to accurately reflect the African-American community on the site and town life in mid-18th-century Upper Marlboro, MD.

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

The Society maintains three historical properties, including the Beall-Dawson House, the Stonestreet Museum of 19th-century Medicine, and the Waters House History Center. Visitors can learn about the county's beginnings at the historic 1815 Beall-Dawson House, an elegant federal style townhome that features period rooms and changing exhibits. The museum tour highlights the culture and daily life of both the upper-class Beall family as well as the enslaved African Americans who labored in the house and on the adjacent property. The Stonestreet Museum offers an insider's look into the developments in medical science that occurred during the career of Dr. Edward E. Stonestreet. Built in 1852, this unique one-room Gothic Revival doctor's office features medical artifacts and implements that demonstrate the fascinating changes that occurred in the 19th and early 20th centuries. The Waters House History Center is housed in oldest house in Germantown—built in three parts, the oldest dates to the mid-1790s. It offers exhibits related to local history.

The Society offers educational programs and lectures; the Beall-Dawson House offers exhibits, tours, and occasional educational and recreation events and programs; the Stonestreet Museum offers exhibits and tours; the Center offers exhibits and occasional recreational and educational programs.

Fort Stark State Historic Site is located on a peninsula historically called Jerry's Point on the southeast corner of New Castle Island. It overlooks the Piscataqua River, Little Harbor, and the Atlantic Ocean. Fort Stark was named in honor of John Stark, commander of New Hampshire forces at the Battle of Bennington (1777). It is one of seven forts built to protect Portsmouth Harbor. A visitor center, located in the old mines building, is open by appointment only.

The site offers exhibits, open by appointment.

The Hammond-Harwood House was built in 1774 for the 25-year-old tobacco planter Matthias Hammond of Anne Arundel County, Maryland. Collecting since 1938, the museum now housed in it has long been the home of some of the finest decorative and fine arts the state of Maryland has had to offer. Today, the museum houses one of the largest collections of paintings by Charles Willson Peale and furniture by John Shaw in the area.

The house offers exhibits, tours, educational programs, occasional lectures, and occasional recreational and educational events.

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.

Drayton Hall, on which construction began in 1738, is the oldest surviving example Georgian Palladian architecture in the U.S. and one of the only pre-Revolutionary houses that remain in close-to-original condition today.

The house offers exhibits, tours, and educational and recreational events and programs.

The luxurious lifestyle enjoyed by two wealthy 18th-century Connecticut Valley families—until their fortunes collapsed—is displayed in the Phelps-Hatheway House and Garden. Merchant Shem Burbank built the house in 1761. As a Tory sympathizer, his business suffered during the American Revolution. In 1788 he sold the house to Oliver Phelps, who in 1794 flaunted the riches earned from land investments in western New York by adding a wing, an architectural masterpiece that still features original Paris-made wallpaper. Eight years later Phelps left Suffield, bankrupted by his failed land schemes. The house is furnished with outstanding 18th-century Connecticut furniture and landscaped with formal flower beds. The Hatheway family owned the house throughout the 1800s, accumulating an attic full of artifacts that document life during that century.

The house offers tours.