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 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.

The Society operates the 1860 Port Washington Historical Society Light Station Museum.

The society offers research library access; the museum offers exhibits and tours.

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.

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 President Benjamin Harrison Home is the former residence of President Benjamin Harrison (1889 to 1893). The museum is dedicated to his achievements
and his impact on United States history.

The home offers exhibits, tours, educational programs, and recreational and educational events (including living history events).

Completed in 1841 when Florida was still a territory, the Union Bank is the state's oldest surviving bank building. Chartered to help finance local cotton plantations, it ultimately closed because of crop failures, the Second Seminole War, and poor management. After the Civil War, it reopened as the Freedman's Savings and Trust Company for emancipated slaves and later served several other functions. In 1971, the Bank was moved from its original site, and, after restoration, it was opened as a museum in 1984. The Union Bank now serves as an extension of the Florida A&M University Black Archives, Research Center, and Museum and is open to the public and school groups only on weekdays. Artifacts and documents reflecting black history and culture are on display, and public programs are provided by Black Archives staff.

The bank offers exhibits.

The Museum is a tribute to Delaware's native son, Eldridge Reeves Johnson, who founded the Victor Talking Machine Company in 1901. Exhibits include phonographs, recordings, memorabilia, trademarks, objects, and paintings that highlight Mr. Johnson's successful business enterprises and chronicle the development of the sound-recording industry.

The museums offers exhibits, tours,

The Museum brings to life the 3,000-year history of farming and ranching in New Mexico. The main building contains more than 24,000-square-feet of exhibit space, along with catering space for meetings and events, a mercantile, and theater. Visitors can watch a cow being milked, stroll along corrals filled with livestock, enjoy several gardens, or watch one of a growing number of demonstrations.

The museum offers exhibits, tours, demonstrations, classes, lectures, and other educational and recreational events and programs.