The Society operates a museum in the historic Paddock Mansion in downtown Watertown, New York. Listed on the National Register of Historic Places in 1979, the mansion was formerly the home of local banker Edwin L. Paddock and his wife, Olive. The home was designed in the Eastlake tradition by architect John Hose, and combined Tuscan Villa elements "for him" and Swiss Chalet "for her." It was built between 1876 and 1878 by John Griffin. Mrs. Olive Paddock bequeathed the home to the Society in 1922, and it was opened as a museum in 1924. The museum contains both Paddock family and local history exhibits, spread throughout three floors and within three outbuildings.

The museum offers exhibits, tours, lectures, research library access and educational and recreational programs.

The Society was founded in 1937. Its current museum holdings include over 150,000 items of Lyon County history spanning from 1865 to the present.

The society offers lectures, research library access, and educational programs; the museum offers exhibits.

The Old Market House, erected by the city of Galena in 1845–1846, served for 65 years as the city market during the decades of Galena's greatest prosperity as a river port, lead-mining center, and commercial hub. The central section's first floor consists of an entry hall with staircases to the basement and second floor, and a large room providing exhibit and meeting space. The wings hold temporary local history exhibits and provide meeting space for community groups.

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

The Isham-Terry House is a time capsule of genteel life in turn-of-the century Hartford. Dr. Oliver Isham bought the 1854 Italianate Villa in 1896. Here he had his physician's office and lived with his sisters Julia and Charlotte. Julia and Charlotte occupied the house until the 1970s, defying the urban renewal juggernaut that demolished so many historic homes. The sisters made so few changes and modernizations to the house that crossing its threshold today is like stepping back in time. Room after room is filled with objects of historical and family significance: ornate gaslight fixtures; stained-glass windows; rare books and paintings; Connecticut-made clocks; and memorabilia from Hartford High School, the Ishams' alma mater. Even Dr. Isham's office, with surgical instruments and medicines, was left undisturbed. Dr. Isham also possessed a rare collection of early Connecticut automobile memorabilia.

The house offers exhibits and tours.

Visitors to the site of this 1835 fur-trading fort can follow the paths of founders Louis Vasquez and Andrew Sublette. The traders employed many of their mountain-man friends, including Baptiste Charbonneau and Jim Beckwourth, at their adobe outpost on the South Platte River.

The museum offers exhibits, tours, and educational programs.

The Museum lies on the original 8.65-acre homestead owned by Chief Ouray and his wife, Chipeta. Migrating from the mountains in the summer to river valleys in the winter, the Utes used the abundant plants and animals of the Uncompahgre River valley for food, clothing, and shelter. Built in 1956 and expanded in 1998, the museum offers one of the most complete collections of the Ute people. The grounds include the Chief Ouray Memorial Park, Chipeta's Crypt, and a native plants garden. Recently renovated and expanded, the museum now includes the Montrose Visitor Information Center, gallery space, classrooms, and a museum store. The museum complex includes shady picnic areas, walking paths, and a memorial to the Spanish conquistadors who traveled through the area in 1776.

The museum offers exhibits, tours, and educational programs.

Early travelers used the Arkansas River as a highway. Just north of the waterway lay a land of tall grasses filled with elk, buffalo, and deer. Explorers such as Audubon, Schoolcraft, and Washington Irving were startled at the expanse of land in this region. Visitors can stroll through this museum's complex of five buildings and explore life on the Arkansas Grand Prairie.

The site offers a short film, exhibits, tours, and occasional recreational and educational events (including living history events).

Fort Ross was a thriving Russian-American Company settlement from 1812 to 1841. This commercial company chartered by Russia's tsarist government controlled all Russian exploration, trade, and settlement in the North Pacific, and established permanent settlements in Alaska and California. Fort Ross was the southernmost settlement in the Russian colonization of the North American continent, and was established as an agricultural base to supply Alaska. Fort Ross was a successfully functioning multicultural settlement for some 30 years. Settlers included Russians, Native Alaskans and Californians, and Creoles (individuals of mixed Russian and native ancestry.) Along with the chapel, the structure of most historical interest at Fort Ross is the Rotchev House, an existing building renovated about 1836 for Alexander Rotchev, the last manager of Ross. It is the only surviving structure. Several other buildings have been reconstructed: the first Russian Orthodox chapel south of Alaska; the stockade; and four other buildings called the Kuskov House, the Officials Barracks, and two corner blockhouses.

The park offers exhibits, tours, educational programs, research library access, and occasional recreational and educational events.

Bodie State Historic Park is a genuine California gold-mining ghost town. Visitors can walk down the deserted streets of a town that once had a population of 10,000 people. The town was founded by Waterman S. Body (William Bodey), who had discovered small amounts of gold in hills north of Mono Lake. In 1877, the Standard Company struck pay dirt and a gold rush transformed Bodie from a town of 20 people to a boomtown. Only a small part of the town survives, preserved in a state of "arrested decay." Interiors remain as they were left and stocked with goods.

The park offers exhibits and tours.

The Society operates the Franklin County Historical Museum. Originally constructed in 1910 as part of Andrew Carnegie's worldwide library construction program, the museum building's high ceilings and dark wood moldings create a period atmosphere for a collection of historic artifacts and information.

The museum offers exhibits and tours.