Graves Mill Historic District

J. Mason Farm is a historic farm located near Ashland, New Castle County, Delaware. The property includes two contributing buildings. They are a stone house (1827) and a stone and frame bank barn (c. 1827). The house is a two-story, gable-roofed, fieldstone structure with a two-story, three bay, frame wing that may have been added in the 1930s or 1940s. The barn walls are of uncoursed fieldstone finished with a pebbled stucco.In the 20th Century, it became part of Ashland Farm, a Du Pont estate. It was added to the National Register of Historic Places in 1986.

Ashland is an unincorporated community in New Castle County, Delaware, United States. Ashland is located at the intersection of Delaware Route 82 and Barley Mill Road along the Red Clay Creek.

Ashland Covered Bridge, also known as Ashland Bridge or Barley Mill Road Covered Bridge, is a covered bridge over Red Clay Creek on Barley Mill Road (near the junction of Brackenville Road) in Ashland in New Castle County, Delaware. It was added to the National Register of Historic Places in 1973.

Mount Cuba Historic District is a national historic district at Mount Cuba, New Castle County, Delaware. It encompasses twelve contributing buildings, one contributing site, and four contributing structures on seven properties that lie along County Road 261. Notable buildings include the Speakman's grist mill, saw mill, and adjoining stone house; and a number of frame dwellings in a variety of popular mid to late 19th-century architectural styles including Gothic Revival. The contributing site is the Mt. Cuba picnic grounds.It was added to the National Register of Historic Places in 1979.

The Samuel P. Dixon Farm is a historic farm near Ashland, New Castle County, Delaware. The property includes three contributing stone buildings: a house, a spring house and a tri-level bank barn. The house is a two-story, four-bay dwelling in two sections. The older section is dated to the late 18th or early 19th century, with an addition before 1830, about the time the barn was built.In the 20th Century, it became part of Ashland Farm, a Du Pont estate. It was added to the National Register of Historic Places in 1986.

Mt. Cuba Center is a non-profit botanical garden located in Hockessin, Delaware, near Wilmington, in the gently rolling hills of the Delaware Piedmont. Its woodland gardens produce some of the most spectacular displays of wildflowers in the mid-Atlantic region. Mt. Cuba is open to the public from April through November for general admission, guided tours and special programs. Education courses, including a Certificate in Ecological Gardening, are offered year-round.

Stockton-Montmorency is a historic house at 1700 Walnut Green Road in Greenville, Delaware. This elegant brick Colonial Revival house, originally just called "Stockton", was designed by William Lawrence Bottomley and built in 1937 for Helen Page Echols and Angus Echols. The house was purchased in the 1960s by Henry E. I. du Pont, who added "Montmorency" to its name.The house was listed on the National Register of Historic Places in 2012.

Cloud-Reese House is a historic home located near Wilmington, New Castle County, Delaware. The original was built about 1770, and forms the rear wing. The main section dates to about 1820, and is a three-bay, two-story, stuccoed stone dwelling. In 1929, the house was renovated in the Colonial Revival style. This included the addition of a wing was added with a kitchen, pantry, laundry, three-car garage, and servants' quarters. Also on the property is a contributing low stone wall.It was added to the National Register of Historic Places in 2001.

Walnut Green School, also known as District School Number 25, is a historic one-room school building located at Greenville, New Castle County, Delaware. It was founded in 1808 and in 1924 was said to be the oldest schoolhouse in the state. It is a one-story, five-bay, rectangular, gambrel-roofed, white-stuccoed stone building in the Colonial Revival style. The school building dates to the late-18th century, but was expanded and remodeled in 1918–1924. The school closed in 1947, because parents wanted their children to go to the AI duPont school district.It was listed on the National Register of Historic Places in 1994.

Mount Cuba Astronomical Observatory is an astronomical observatory is located at 1610 Hillside Mill Road, Greenville, Delaware, United States. This observatory is home to a 0.6-meter telescope used by the Delaware Astronomical Society, the University of Delaware, and the Whole Earth Telescope. Associated with the Observatory is the Mt. Cuba Astronomy Group (MCAG). The MCAG is composed of interested amateurs and engages in astronomy education and public outreach. Meetings are held the second Tuesday of each month at the Mt. Cuba Astronomical Observatory. A Sunquest sundial, designed and machined by Richard L. Schmoyer, is on the Mount Cuba Observatory grounds near the parking lot. This mean time sundial automatically corrects for the equation of time through the use of an analemma-inspired gnomon.

The Greenville Country Club, formerly known as the Owl's Nest Country Place, is a country club at 201 Owl's Nest Road in Greenville, Delaware. The 18-acre (7.3 ha) property was developed in 1915 by Eugene du Pont, Jr., son of Eugene du Pont, as a country estate. It was one of the first major estates to be built by members of the Du Pont family in northern Delaware. The main house and three outbuildings were designed by Harrie T. Lindeberg in the Tudor Revival style, and were built in 1915. The estate's grounds were landscaped by Franklin Meehan and William Warner Parker. In 1928 an Ellen Shipman-designed boxwood garden was added to the grounds. The estate has been home to the Greenville Country Club since 1961.The property was listed on the National Register of Historic Places in 2010.

Garrett Snuff Mills Historic District is a national historic district located at Yorklyn, New Castle County, Delaware. The district encompasses 31 contributing buildings, including the 14 buildings previously listed in the Garrett Snuff Mill. The 17 additional buildings are 19th century domestic buildings associated with the mills. They include the mill owner's and supervisor's houses, a late Victorian frame house, and four rows of workers' housing.It was listed on the National Register of Historic Places in 1980.