At the turn-of-the-century, George C. Boldt (1851–1916), millionaire proprietor of the world famous Waldorf Astoria Hotel in New York City, set out to build a full size Rhineland castle in Alexandria Bay, on picturesque Heart Island. The grandiose structure was to be a display of his love for his wife, Louise. On the death of his wife in 1904, construction was ceased. The site tells of the Boldts' lifestyle and the history of the 1000 Islands region. There are a total of six structures: the Castle; the Power House, which was inspired by Medieval architecture and contains a period steam engine; the Alster Tower, used for entertainment purposes; the Hennery, containing a water tank and pigeon house; the Arch, modeled after Roman monuments, and a stone Gazebo.

Boldt Castle offers a 15 minute film, exhibits, and self-guided tours.

The Itawamba Historical Society works to preserve the history of Itawamba County, Mississippi, located in the northeast corner of the state. The society operates the George Poteet History Center, the Gaither Spradling Library and Historic Bonds House Museum.

The society offers tours of the Bonds House Museum and presentations and lectures in the George Poteet History Center. The Bonds House and Gaither Spradling Library also house archives. The website offers archival access, visitor information, and online copies of the quarterly society newsletter.

The Palmer Lake Historical Society is dedicated to preserving the history of Palmer Lake, Monument, and the Palmer Divide. The society owns and operates a local history museum, and also is active in the preservation of the Crawford Memorial, a memorial to a Medal of Honor recipient from the town of Palmer Lake.

The society offers walking tours of Palmer Lake and Monument, exhibits, and presentations in the society museum. The website offers visitor information and a brief history of the area.

Villa Louis is the Victorian home of one of Wisconsin's most wealthy families. Today, visitors can explore the entire estate, from the mansion to the estate's outbuildings. In addition to the historic estate, the current park contains a museum that chronicles the history of the fur trade.

The estate offers guided tours, field trip plans which can be catered to different grades, and a visitor center that serves as a museum of the estate. The website offers an extensive virtual tour of the estate, visitor information, and a brief history of the estate.

Cobb County Landmarks and Historical Society works to preserve important structures and landmarks throughout the whole of Cobb County, and focuses on both preservation and education. The society also owns and operates two museums, the Root House Museum and the Power Cabin. Both a fully restored historic homes, and play host to school field trips and visitors.

The society offers traveling trunk exhibits and lectures, tours designed for both school and home-schooled groups, and special classes for children. The website offers visitor information and an events calendar.

The San Francisco Plantation is located along the banks of the Mississippi River and, from the plantation website, "is a galleried house of the Creole open suite style and is nestled under centuries old Live Oaks and contains one of the finest antique collections in the country." The home is open from November until March, and offers individual and group tours and also plays host to many weddings throughout the year.

The home offers individual and group tours. The website offers visitor information and a brief history of the home. In order to contact the plantation by email, use the "contact us" link located at the top of the webpage.

The Longfellow-Evangeline State Historic Site, located along the Bayou Teche in southern Louisiana, preserves the 1815 plantation home Maison Olivier and presents a reproduction of an early 1800s Acadian farmstead, including a family home, outdoor kitchen, slave quarters, and barn.

The historic site offers tours, exhibits, and occasional special events. The website offers a history of the historic site, as well as visitor information, a short virtual tour, and a listing of nearby attractions.

The Old Cowtown Museum is a living history museum where visitors can experience life in the midwest during the 1870s. Old Cowtown consists of a visitor's center, which offers exhibits and visitor information, as well as a fully reconstructed pioneer town. The reconstructed town contains a residential section, a blacksmithing shop, a business area, and a farm.

The museum offers educational programs, including tours tailored for specific grade groups; wagon rides; costumed interpreters; historic structures furnished with time period furnishings; and special events such as lectures, reenactments, and special interpretive events. The website offers visitor information, information regarding educational programs, supplemental materials for teachers including lesson plans and worksheets, and an events calendar.

The Natick Historical Society is dedicated to preserving and showcasing the history of Natick, Massachusetts, from its inauspicious beginnings as a Praying Indian Plantation to the present day. The society owns and operates a local history museum and research library.

The museum offers collections and exhibits that cover the history of Natick from its inception until the present day. The society offers educational programs for schoolchildren and special events including lectures and presentations. The website offers visitor information, a history of Natick, and information on upcoming special events.

The Caldwell Birthplace is a historic house museum showcasing the birthplace of famous author Erskine Caldwell. In addition to being preserved in its condition at the time of Caldwell's birth, the museum offers books written by and about Erskine Caldwell, items that belonged to Caldwell or his parents, and photographs from various period of his life.

The museum is open on weekends and offers self-guided tours. The website offers visitor information and recent news regarding the museum.