The Read House and Garden is a 14,000 square-feet (1,300 square meters) mansion with over 20 rooms, thus, being the largest mansion built in the state of Delaware in 1793. The mansion was built in the early-19th Century and depicts the luxuriant life of aristocrats in the state in that period. One will also notice cutting-edge technology that was being used back then in their kitchen such as hot-air roasting ovens and steam tables. The garden is full of rare and exotic plants and trees. The Read House and Garden is a must-visit to know the local culture as well.

The Old New Castle Court House is one of the few lasting courthouses of the 1600s in the United States. Built in 1730, the building now functions as a splendid museum for local history and culture. Featuring an impressive collection of exhibits that trace the town's history of Swedish, Dutch and English colonization, as well as the establishment of Delaware as a state. Visitors can take guided tours of the courthouse and learn more about its glorious history, intriguing court cases, and more.

The Dutch House possesses a huge collection of historical items used by the Dutch who lived in Delaware. Built in the late-17th Century, the house was initially occupied by English methods when the region was an English colony. Today, the carefully restored structure is a popular house museum that allows visitors to step back in time and witness its intriguing history. Visitors can take a tour of the house to explore its interiors, which include an antique spoon rack, a cupboard, a Bible from 1714, and other Dutch Colonial artifacts.

Immanuel Episcopal Church is a historic church in New Castle that forms part of the New Castle Historic District. First built in 1689, the church underwent several restorations and expansions through the centuries in the Victorian style. Featuring a clipped gable roof and stucco interiors and a peaceful cemetery in its yard, the church is a long-standing remnant of the town's bygone era. Its calm surroundings, quaint interiors and spiritual atmosphere make the Immanuel Episcopal Church one of the must-visit religious landmarks in the city.

This 18th-century mansion is the majestic site that exemplifies Georgian architecture in New Castle. Built in the 1730s by Dr. John Finney, a wealthy townsman, the beautiful house is one of the only few surviving structures of its kind in the town. Today, visitors can take guided and self-guided tours of the house and travel to the past to trace the intriguing history of New Castle as a flourishing town to its eventual decline. Listed on the National Register of Historic Places, the Amstel House is a must-visit landmark in the town.

This monument sits mainly in the state of Delaware but also extends into Pennsylvania. The monument memorializes Delaware's significant role in American history as the first state to ratify the Constitution. The monument comprises several historic sites including the Dover Green, the New Castle Courthouse, Woodlawn Tract, the Old Swedes' Church, and the New Castle Sheriff's House. The various sites chronicle the initial settlement of Delaware by various different Europeans, as well as recognizing their interactions with the Native Americans of the area.

The building of Jessop's Tavern dates back to 1674, when it was built as a private residence. Owned by the Day Family now, this colonial-style bar honors its Dutch, English and Swedish heritage in its cheeses, grub and drinks. It is named after Abraham Jessop, a coppersmith who bought the place in 1724. When in town, head over to this historic place for a unique meal in a colonial setting. The menu features local specialties like Olde English Flat Bread, Steamboat Shrimp, and New Sweden Meatloaf, along with and elaborate beer and wine list to be paired with the delicacies.

Battery Park is a beautiful recreational park in New Castle. Situated along the beautifully serene banks of the Delaware River, the park serves as a tranquil green space to unwind and relax in the town. Visit the park and explore its scenic environs as you follow the shimmering river along its bank, go for a refreshing morning jog, or enjoy a picnic with your loved ones under the cool shade of towering trees. A peaceful experience in the town, Battery Park is a must-visit family attraction in New Castle.

Bellanca Airfield Museum finds its home in the old Air Service Hangar in New Castle that dates back to the year 1928. Build in honor of Guiseppe M. Bellanca, the Italian-American aviator and airplane designer, the museum perpetuates his legacy and aims to acquaint visitors with his life and career. Here, you can learn more about Bellanca's early life and career, the planes he built, and the pilots who flew them. A must-visit attraction for flight enthusiasts, Bellanca Airfield Museum makes for a spectacular lesson in history.