Wentworth by the Sea

Wentworth–Coolidge Mansion is a 40-room clapboard house which was built as the home, offices and working farm of colonial Governor Benning Wentworth of New Hampshire. It is located on the water at 375 Little Harbor Road, about two miles southeast of the center of Portsmouth. It is one of the few royal governors' residences to survive almost unchanged. The site is a New Hampshire state park, declared a National Historic Landmark in 1968. Today, the New Hampshire Bureau of Historic Sites manages the site with the assistance of the Wentworth-Coolidge Commission, a group of volunteer civic and business leaders appointed by the Governor.

The Wentworth-Gardner House is a historic mid-Georgian house, located at 50 Mechanic Street in Portsmouth, New Hampshire, United States. The house is operated as a museum by the Wentworth-Gardner Historic House Association. It is one of the finest extant examples of high-style Georgian architecture in New England, and played a role in the architectural preservation movement of the early 20th century. It was declared a National Historic Landmark in 1968.

Fort Stark is a former military fortification in New Castle, New Hampshire, United States. Located at Jerry's Point (also called Jaffrey's Point) on the southeastern tip of New Castle Island, most of the surviving fort was developed in the early 20th century, following the Spanish–American War, although there were several earlier fortifications on the site, portions of which survive. The fort was named for John Stark, a New Hampshire officer who distinguished himself at the Battle of Bennington in the American Revolution. The purpose of Fort Stark was to defend the harbor of nearby Portsmouth and the Portsmouth Naval Shipyard. The fort remained in active use through the Second World War, after which it was used for reserve training by the US Navy. The property was partially turned over to the state of New Hampshire in 1979, which established Fort Stark Historic Site, and the remainder of the property was turned over in 1983. The grounds are open to the public during daylight hours.

The New Castle Congregational Church is a congregation of the United Church of Christ, located at 65 Main Street in New Castle, New Hampshire. Its church, the only ecclesiastical building in the small community, was built in 1828 by a local master builder, based on the architectural patterns published by Asher Benjamin, and also based in part on the St. John's Church in nearby Portsmouth. It has undergone little alteration since its construction.The building was listed on the National Register of Historic Places in 2015, and the New Hampshire State Register of Historic Places in 2007.

New Castle is a town in Rockingham County, New Hampshire, United States. The population was 1,000 at the 2020 census. It is the smallest and easternmost town in New Hampshire, and the only one located entirely on islands. It is home to Fort Constitution Historic Site, Fort Stark Historic Site, and the New Castle Common, a 31-acre (13 ha) recreation area on the Atlantic Ocean. New Castle is also home to a United States Coast Guard station, as well as the historic Wentworth by the Sea hotel.

Portsmouth Naval Prison is a former U.S. Navy and Marine Corps prison on the grounds of the Portsmouth Naval Shipyard (PNS) in Kittery, Maine. The building has the appearance of a castle. The reinforced concrete naval prison was occupied from 1908 until 1974.

Rye Air Force Station (ADC ID: M-104) is a closed United States Air Force General Surveillance Radar station. It is located 3.1 miles (5.0 km) southeast of Portsmouth, New Hampshire in what is now Odiorne Point State Park. It was closed in 1957.

The Harbor Defenses of Portsmouth was a United States Army Coast Artillery Corps harbor defense command. It coordinated the coast defenses of Portsmouth, New Hampshire and the nearby Portsmouth Naval Shipyard in Kittery, Maine from 1900 to 1950, both on the Piscataqua River, beginning with the Endicott program. These included both coast artillery forts and underwater minefields. The command originated circa 1900 as the Portsmouth Artillery District, was renamed Coast Defenses of Portsmouth in 1913, and again renamed Harbor Defenses of Portsmouth in 1925.

The Capture of Fort William and Mary took place in Portsmouth, New Hampshire, on December 14, 1774, when local Patriots led by John Langdon stormed Fort William and Mary guarding the mouth of the busy seaport. They overcame a six-man caretaker detachment) and seized the garrison's powder, which was distributed through several towns in the colony for potential use in the looming struggle against Great Britain. On December 15, 1774, patriots led by John Sullivan again raided the fort, this time seizing numerous cannons, later used in the pivotal Battle of Bunker Hill. The incident is significant as one of the first overt acts of the American Revolutionary War and the only battle to take place in the state of New Hampshire.

Odiorne Point State Park is a public recreation area located on the Atlantic seacoast in the town of Rye near Portsmouth, New Hampshire. Among the park's features are the Seacoast Science Center and the remains of the World War II Fort Dearborn. The park offers opportunities for hiking, cycling, picnicking, fishing, and boating.

Fort William and Mary was a colonial fortification in Britain's worldwide system of defenses, defended by soldiers of the Province of New Hampshire who reported directly to the royal governor. The fort, originally known as "The Castle," was situated on the island of New Castle, New Hampshire, at the mouth of the Piscataqua River estuary. It was renamed Fort William and Mary circa 1692, after the accession of the monarchs William III and Mary II to the British throne. It was captured by Patriot forces, recaptured, and later abandoned by the British in the Revolutionary War. The fort was renamed Fort Constitution in 1808 following rebuilding. The fort was further rebuilt and expanded through 1899 and served actively through World War II.

Seavey's Island, site of the Portsmouth Naval Shipyard, is located in the Piscataqua River in Kittery, Maine, United States, opposite Portsmouth, New Hampshire. It encompasses 278 acres (1.13 km2).