Intercollegiate Studies Institute

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.

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.

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.

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.

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.

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.

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

Charles Springer Tavern, also known as the Oak Hill Inn, Four Mile Inn, and Sign of the Three Tons, is a historic inn and tavern located near Wilmington, New Castle County, Delaware, USA. The building is a two-story, log and stone building that evolved in four major construction phases during the period from 1750 to 1850. The oldest section is a two-story, two-bay, gable-roofed log section. A stone, two-story, two-bay, gable-roofed section was added about 1780; the roof level, window and door openings and floor levels were subsequently raised on the original log section; and a stone, 1+1⁄2-story lean-to was added on the rear wall of the log section. It has been a residence since the early 20th century. It is in a vernacular Federal style. Also on the property are the contributing ruins of a stone barn built in 1852, the ruins of a stone springhouse, and a stone mileage marker identifying the location as being four miles from the City of Wilmington.It was added to the National Register of Historic Places in 1992.

James Armor House is a historic home located near Wilmington, New Castle County, Delaware. It is a 2+1⁄2-story, stuccoed stone and frame dwelling that was constructed in three major building phases. It consists of a two-story stone rear wing dating to about 1804, a 2+1⁄2-story vernacular Italianate style stone main block built about 1850, and two-story Colonial Revival style frame wing built in the 1930s. Also on the property is a contributing garage/workshop built in the 1930s.It was added to the National Register of Historic Places in 1992.

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.