Question: How many historic buildings are located at the Antebellum Plantation and Farmyard museum?
About the article "Stone Mountain", section "Places of interest".

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Confederate Hall, operated directly by the Stone Mountain Memorial Association or SMMA, is a museum that educates students and park guests on the geology and ecology of Stone Mountain as well as historical aspects of the area.
A small theater shows a historical documentary about the Civil War in Georgia called "The Battle for Georgia".
The education department is host to thousands of students each school year teaching the subjects of geology, ecology, and history.
Classes are designed to meet the Georgia Performance Standards and the North American Association for Environmental Education guidelines.
The Antebellum Plantation and Farmyard is an open air museum composed of 19 historic buildings, built between 1790 and 1875, which have been re-erected to the site to represent a pre-Civil War Georgia plantation.
The historic houses have been furnished with an extensive collection of period furniture and decorations.
The farm features live animals that guests can pet.
A 732-bell carillon that originated at the 1964 New York World's Fair, provides a daily concert.
A covered bridge, dating from 1892, which originally spanned the Oconee River in Athens, Georgia.
A grist mill, dating from 1869 and moved to the park in 1965.
Stagville Plantation is located in Durham County, North Carolina.
With buildings constructed from the late 18th century to the mid-19th century, Stagville was part of one of the largest plantation complexes in the American South.
The entire complex was owned by the Bennehan and Cameron families; it comprised roughly 30,000 acres (120 km²) and was home to almost 900 enslaved African-Americans in 1860.
The remains of Historic Stagville consist of , in three tracts, and provide a unique look at North Carolina's history and general infrastructure in the antebellum South.
Among structures on the Stagville site are several historic houses and barns, including the original Bennehan House and some of the original slave quarters, which were known as Horton Grove.
The Bennehan House, built 1787 with a large addition in 1799, was listed on the National Register of Historic Places in 1973; and Horton Grove, two-story slave residences built in 1850, was listed in 1978.
The slave residences are well preserved and are the only two-story slave quarters remaining in North Carolina.
Significant archaeological finds around the houses have given archaeologists and historians a glimpse into the lives of the many enslaved people who lived and worked at Stagville and throughout the Bennehan-Cameron holdings.
In 1976, Liggett and Meyers Tobacco Company, which had owned and worked the land for decades, donated the property to the state of North Carolina, which operates the site as an historic house museum known as Historic Stagville. 
In 1957, Waveland became a museum that depicted Kentucky life from pioneer days to the Civil War.
The house sits on 10 acres of land and now depicts life on a plantation during the 1840s.
Period-appropriate furniture was donated to the site.
Many of the buildings did not survive, but Waveland currently contains the mansion, decorated in Antebellum style, and four outbuildings, which are the ice house, a two-story brick building that was the slave quarters, a barn, and a smokehouse.
Tours are given daily for much of the year, and the tour guides dress in the style of the 1840s.
Tours include the historic house, the slave quarters, smokehouse and ice house, and focus on the Bryan family and life on a 19th century Kentucky plantation. 
A number of buildings and homes in Evans County are on the National Register of Historic Places.
In Claxton, there is the Dr. James W. Daniel House; the Evans County Courthouse; and the Mitchell J.
Green Plantation.
In Hagan, there is the George W. DeLoach House.
And at Camp Oliver there is the Glissom, Remer, Store (DOE).
Other places of interest include the Daisy Post Office and the train depot in Bellville.
Evans County is also home to a number of antebellum houses that were built prior to the formation of the county.
Many of these homes were built in the Plantation Plain style and include the A.D. Eason House; the Thomas A. Durrence House; and the Edwards-Strickland House. 
A number of buildings and homes in Evans County are on the National Register of Historic Places.
In Claxton, there is the Dr. James W. Daniel House; the Evans County Courthouse; and the Mitchell J.
Green Plantation.
In Hagan, there is the George W. DeLoach House.
And at Camp Oliver there is the Glissom, Remer, Store (DOE).
Other places of interest include the Daisy Post Office and the train depot in Bellville.
Evans County is also home to a number of antebellum houses that were built prior to the formation of the county.
Many of these homes were built in the Plantation Plain style and include the A.D. Eason House; the Thomas A. Durrence House; and the Edwards-Strickland House.