There is already an entry for Blandwood Mansion. Preservation Greensboro Inc. is just a preservation organization.

Ker Place is a circa 1800 Federal-style residence, now serving as a historic house museum. The museum provides information on the history of Virginia's Eastern shore.

The museum offers guided tours, an archaeology lab, period rooms, and history camps.

The site is operated by the Eastern Shore of Virginia Historical Society, which is listed separately. I've combined the two entries, as they operate from the same site, Ker Place. The combined entry is node identification number 11575.

The Lily House & Gardens comprise a 26-acre estate. The 22-room mansion includes 8 period rooms, with approximately 90 percent of the home's original 1930s furnishings and decorative arts, and information on the American Country Place era (late 1800s-early1900s), the history of Oldfields, and 20th century Indianapolis. Collections include books, military miniatures, nautical items, and gold coins. The garden designs date to the 1920s.

The site offers guided and audio tours of the Lily House, guided garden tours, period rooms, and exhibits.

Built about 1750, Boxwood Hall became the residence of Elias Boudinot, president of the Continental Congress that ratified the Peace Treaty with Great Britain. George Washington visited his friend Boudinot in 1789 on his way to New York for his first inauguration.

Cannot find a website.

The Fairmount Association is dedicated to preserving the structures and architecture present in the Fairmount Southside Historic District. The district is home of one of the nation's richest collections of turn of the century housing.

The association offers special events including lectures and receptions as well as an annual home tour. The website offers a history of Fairmount, visitor information, an extensive photo gallery with photographs of homes throughout the district, and information about the home tour.

Preservation organization, does not offer educational interpretative for K–12 students.

Double Ditch Indian Village, overlooking the Missouri River, was a large earthlodge village inhabited by Mandan Indians between about 1500 and 1781. The remains of earthlodges, midden mounds (trash heaps), and fortification ditches are clearly visible today. Interpretive signs are posted throughout the site.

The site is open to the public.

Website does not specify any interpretive services available at the site, beyond signage.

Somers Mansion was built about 1725 by Richard Somers and is the oldest existing house in Atlantic County. Somers operated the first ferry across Great Egg Harbor Bay.

Cannot find a website.

Lafayette Square is St. Louis's oldest historic district and was declared a National Historic District in 1979. The neighborhood surrounds a 30-acre Victorian park that is the oldest park west of the Mississippi River. The park serves as the hub for 375 Victorian homes of French Second Empire, Romanesque, Italianate, Queen Anne, and Federal designs. The Lafayette Square Restoration Committee has worked to restore over 90 percent of these homes to their original states.

The Committee sponsors several activities and programs throughout the year, including house and garden tours as well as a free concert series. The website offers historical information regarding the neighborhood, an events calendar, library access, and several photo galleries of the neighborhood.

Neighborhood preservation organization, not oriented to education.

The Delaware and Lehigh National Heritage Corridor consists of five Pennsylvania counties which are filled with heritage and outdoor activities.

The Corridor has many activities suitable for schoolchildren as well as adults interested in history, from outdoor activities such as hiking and fishing to historical sites such as canals and bridges. The website offers visitor information, basic historical information, a picture gallery that provides a virtual tour of the corridor, and online interactive activities for schoolchildren.

Seems more an umbrella site than oriented to specific historic sites.