Mount Cuba Astronomical Observatory

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.

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 Intercollegiate Studies Institute (ISI) is a nonprofit educational organization that promotes conservative thought on college campuses.It was founded in 1953 by Frank Chodorov with William F. Buckley Jr. as its first president. It sponsors lectures and debates on college campuses, publishes books and journals, provides funding and editorial assistance to a network of conservative and libertarian college newspapers, and finances graduate fellowships.Some financial information about the organization is published on their website (for FYE 30 June 2021). However their financials shown on their website differ somewhat from their filed IRS Form-990. For their fiscal year ending 30 June 2021: their donations were $5,809,831; their revenue was $7,078,238; and their expenses were $6,195,894.

Hoopes Reservoir is a reservoir in New Castle County, Delaware. The reservoir first impounded the water of Old Mill Stream and Red Clay Creek in 1932, with a dam built by the city of Wilmington, Delaware, for municipal drinking water. It has a water surface of 187 acres, a maximum capacity of 11,000 acre-feet, and a normal capacity of 6300 acre-feet. The reservoir and its surroundings have been open to the public since 1971. It is the largest reservoir in Delaware. The dam, Edgar M. Hoopes Dam (National ID # DE00015), is a concrete gravity dam originally built in 1932 and restructured several times since. It is 135 feet high and 845 feet in length at the crest. Its namesake, Edgar M. Hoopes, was Chief Engineer of the Wilmington Water Department from 1913 through 1918, according to a plaque on site.

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.

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.

Wooddale Historic District, also known as the Delaware Iron Works, is a national historic district located at Wooddale in New Castle County, Delaware.

Wooddale is an unincorporated community in New Castle County, Delaware, United States. Wooddale is located along the Red Clay Creek and Rolling Mill Road, west of Wilmington.

Wooddale Bridge is a covered bridge over Red Clay Creek at Wooddale in New Castle County, Delaware. It is one of three covered bridges in the state of Delaware along with the very similar Ashland Covered Bridge and the Smith Bridge. It and the Ashland bridge remain, of the thirteen bridges along the Red Clay Creek that were marked on an 1868 map.

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.

Graves Mill Historic District is a national historic district located near Ashland, New Castle County, Delaware. It encompasses 7 contributing buildings and 2 contributing structures that are associated with Graves Mill. They include the Samuel Graves Mill, the Hayes Graves House and barn, the David Graves House and barn, and two houses associated with William Armstrong.It was added to the National Register of Historic Places in 1979.

The Tatnall School is a private college preparatory private school in unincorporated New Castle County, Delaware; it has a Wilmington postal address and is adjacent to, but not in, the Greenville census-designated place.The school is for students from three years old through 12th grade. The school was founded as an all-girls school in 1930 by Frances Dorr Swift Tatnall at her home in downtown Wilmington, Delaware, and moved to its current location in 1952. Tatnall began to admit boys in 1952 (the class of 1964). The school's mascot is the hornet. Its motto is "Omnia in caritate", which means all things in love.