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Lesley-Travers Mansion, also known as the Deemer House, Travers House, and Lesley House, is a historic home located at New Castle, New Castle County, Delaware. It was designed by noted Baltimore architects Thomas and James Dixon and built in 1855. It has a two-story, five-bay, brick core with several appendages and wings. It has a castle-like appearance, with a slate-covered steeply pitched gable roof and five-story tower, and is in the Gothic Revival style.It was added to the National Register of Historic Places in 1973.

Delaware Valley Classical School is a private, K-12 classical Christian school located in New Castle, Delaware. For the 2023–24 academic year, enrollment was approximately 190 students, with approximately 30 faculty and staff.

The Hermitage was a historic home located at New Castle, New Castle County, Delaware. It was built between about 1700 and 1818, and consisted of three brick sections. The oldest section was the 2+1⁄2-story west wing. There was a two-story, rear kitchen wing, with servant's quarters above. The main section was built in 1818, and was a two-story, three-bay structure. It was built by U.S. Senator Nicholas Van Dyke (1770–1826) as a farm and summer retreat for his family.The house was added to the National Register of Historic Places in 1973.The Hermitage was heavily damaged by fire between 5:00 p.m. and 10:00 p.m. on February 18, 2007, in an act of arson. Following the fire, the two oldest sections of the house were completely destroyed, with only the walls left standing. The newer section (circa 1810) of the house was relatively intact, including a marble fireplace in the front, and a carved and gesso mantle and woodwork in the rear. Declared a safety hazard by the city of New Castle, the remains of the Hermitage were torn down in 2009. Nothing was salvaged.

New Castle is a city in New Castle County, Delaware, United States. The city is located six miles (10 km) south of Wilmington and is situated on the Delaware River. As of 2020, the city's population was 5,551. New Castle constitutes part of the Delaware Valley or Philadelphia metropolitan area.

The Bellanca Airfield Museum is an aviation museum located in New Castle, Delaware focused on the history of Bellanca Airfield.

The Bellanca Airfield was an airfield, aircraft plant, and service hangar built in 1928 by Giuseppe Bellanca and Henry B. DuPont in New Castle, Delaware. Located off Route 273 near the Delaware River, the plant produced approximately 3000 aircraft before closing in 1954. The only surviving part of the airfield is the former Air Service, Inc. hangar, which was listed on the National Register of Historic Places in 2005.

William Penn High School, also known as William Penn or simply Penn, is a four-year comprehensive, coeducational public high school located in unincorporated New Castle County, Delaware, United States. It is adjacent to the New Castle city limits and has a New Castle postal address. The school is a member of the Colonial School District, and is the largest high school in the state of Delaware. The school mascot is the Colonial. In addition to New Castle the school district includes Delaware City, Port Penn, St. Georges, Wilmington Manor, portions of Wilmington, and half of Bear.

Amstel House, also known as Dr. Finney House, is a preserved building in New Castle, Delaware, United States, built in the 1730s. The decline of New Castle in the 19th century meant that many owners of homes could no longer afford to make changes to them, which is why so many buildings were preserved. That changed, however, when New Castle was "rediscovered" during the Colonial Revival phase of the 1920s and 1930s and old buildings began to be torn down and replaced by new construction.In 1931, to protect New Castle's heritage, a group of concerned citizens raised funds to buy the Amstel House, which faced an uncertain fate. This was the town's first formal preservation effort. Shortly thereafter the group evolved into the New Castle Historical Society which, in the 75 years that have followed, has worked closely with the city and other civic organizations to save, preserve and restore many of the town's historic architectural treasures. It was listed on the National Register of Historic Places in 1977.

Battery Park is a public park in New Castle, Delaware bordered by West 3rd Street, Delaware Street and the Delaware River. The Separation Day celebration commemorating the political division of Delaware from Pennsylvania is held here in mid-June annually.

First State National Historical Park is a National Park Service unit which lies primarily in the state of Delaware but which extends partly into Pennsylvania in Chadds Ford. Initially created as First State National Monument by President Barack Obama under the Antiquities Act on March 25, 2013, the park was later redesignated as First State National Historical Park by Congress.

The New Castle Court House Museum is the center of a circle with a 12-mile radius that defines most of the border between the states of Delaware and Pennsylvania and parts of the borders between Delaware and New Jersey and Maryland.It is one of the oldest courthouses in the United States and has played a role in a number of historic events. It was declared a National Historic Landmark in 1972. The building is also a contributing property to a second National Historic Landmark, the New Castle Historic District. It is part of First State National Historical Park.

The Dutch House is a late-17th-century house in New Castle in the U.S. state of Delaware. Built during New Castle's colonial period, it is considered one of the oldest houses in the state. The house has been used for various purposes throughout its history, including as a rental property, storehouse, and historic house museum. The Dutch House is currently managed by the New Castle Historical Society.