The Hopewellian mounds at Toolesboro are among the best-preserved and accessible remnants of an ancient culture flourishing from around 200 B.C. to 300 A.D. The five-acre site includes several large surviving mounds, an education center, and a prairie demonstration plot.

The site offers exhibits.

The Farnsworth House is one of the most significant architectural works of the 20th century. The home, built in 1951, was conceived as a country retreat for Dr. Edith Farnsworth in 1945. The structure "represents the ultimate refinement of [architect] Mies van der Rohe's minimalist expression," and is "perhaps the fullest expression of modernist ideals," according to the home's website. Today, the home stands as a historic house museum and monument to architectural excellence.

The house offers guided tours, while the website offers a history of the house, a brief biography of Mies van der Rohe, and visitor information. In order to contact the website via email, use the "contact" link located at the bottom of the webpage.

The Marple Historical Society is dedicated to preserving the heritage of Marple Township, which is located outside of Philadelphia, Pennsylvania. The society operates the Hilda Lucas Memorial Library and Museum, which contains exhibits on local history and a collection of historical artifacts, documents, and photographs.

The society offers exhibits in the Hilda Lucas Memorial Library and Museum as well as a lecture series. The website offers visitor information, historical information about Marple Township, and a photo gallery of historic Marple Township.

Postville Courthouse is a reproduction of Logan County's first seat of government. Constructed in 1840, the original building until 1848 was one of the courts in which Abraham Lincoln argued cases while traveling the historic Eighth Judicial Circuit. The first floor has a reception and orientation room and an exhibit gallery. On the second floor are rooms representing an 1840s courtroom and a county office.

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

The Zwaanendael Museum works to preserve and present military, social, and maritime history in the Lewes area of Delaware. From the museum website: "Modeled after the town hall in Hoorn, the Netherlands, the museum commemorates the founding of Delaware's first European settlement by the Dutch in 1631."

The museum offers guided tours, exhibits regarding local history, and field trip programs catered to specific grades from kindergarten through fifth grade. The website offers visitor information.

The Historical Society of Frederick County is dedicated to preserving and raising awareness of the history of Frederick County, Maryland. The society owns and operates a local history museum as well as a historic house museum, the Taney House. The museum boasts an impressive collection of decorative and fine arts, including a unique collection of tower clocks.

Both the museum and Taney House offer special events, guided tours, educational events, and exhibitions. The website offers visitor information, a brief history of Frederick County, an events calendar, and teacher resources including a newsletter and a book guide.

The Northwood Hills Neighborhood Association is dedicated to maintaining the history of the Northwood Hills Neighborhood as well as functioning as a typical neighborhood association. In particular, the association works with other local groups in order to preserve important historic structures.

The association offers tours of historic and architecturally significant homes. The website offers information regarding upcoming tours and events. In order to contact the association via email, use the "contact us" link located on the left side of the webpage.

The Miami Design Preservation League seeks to preserve and share the history of Miami's architecture, both within and outside of the Miami Beach Architectural Historic District. Miami is perhaps most widely known for its Art Deco architecture. However, the historic district includes Art Deco, Mediterranean Revival, and Miami Modern (MiMo) structures.

The league offers a film series, lectures, a gallery with exhibits related to the Art Deco movement, guided walking tours, iPod or cellphone self-guided walking tours, and guided bicycle or Segway tours.

The Dyckman House Park consists of a circa 1784 Dutch Colonial farmhouse, surrounded by a small park, in New York City. The site focuses on the years 1815 through 1820 and 1915 through 1916, referred to by the park as the "farm" and "city" periods of the property.

The park offers period rooms, guided tours, educational programs which meet state educational standards. Reservations are required for groups of ten or more. The website offers pre- and post-visit activities.

The Civil War Preservation Trust is America's largest non-profit organization (501-C3) devoted to the preservation of our nation's endangered Civil War battlefields. The Trust also promotes educational programs and heritage tourism initiatives to inform the public of the war’s history and the fundamental conflicts that sparked it.