The New Castle Historic District is located in New Castle, Delaware, and is known for its well-preserved colonial architecture. Established in the 17th century, the district features buildings that reflect various architectural styles, including Colonial, Georgian, and Federal. Visitors can explore charming streets lined with historic homes, many of which date back to the 18th century. The district is also home to significant landmarks, such as the New Castle Court House and the Amstel House. These sites provide insight into the area's rich history and its role in early American governance. The New Castle Historic District is a designated National Historic Landmark, attracting history enthusiasts and tourists alike.