Montcalm Park Historic District

George B. Sloan Estate is a historic home located at Oswego in Oswego County, New York. It is a 2+1⁄2-story, irregularly massed, Ithaca limestone building built between 1866 and 1870 in the Italian Villa style. It features a square, 3-story engaged tower. Also on the property is a carriage house, cast-iron fence, and fountain.It was listed on the National Register of Historic Places in 1988.

Oswego Yacht Club is a yacht club, established in 1881, located in Oswego, New York.

John and Harriet McKenzie House is a historic home located at Oswego in Oswego County, New York. It is a 1+1⁄2-story, rectangular frame residence with Greek Revival details. Its owner John McKenzie was a former fugitive slave who built the house about 1847. Two years later Nathan and Clarissa Green built their house next door.It was listed on the National Register of Historic Places in 2001.

Nathan and Clarissa Green House is a historic home located at Oswego in Oswego County, New York. It is a two-story wood-frame residence with a gabled, three-bay facade and side entrance, built about 1849 with Greek Revival details. It was built by Nathan Green, an African American and fugitive slave, who purchased the lot from Gerrit Smith. It is located next to the John and Harriet McKenzie House.It was listed on the National Register of Historic Places in 2002.

Derrick Boat No. 8, also known as DB 8, is a historic floating derrick located at Oswego, Oswego County, New York. It was built in 1927, and it is one of the few surviving steam-powered floating derricks to have worked on the New York State Barge Canal. It has a 75 foot by 28 foot hull composed of both riveted and welded heavy steel plate. The site of the vessel's caretaker is the H. Lee White Marine Museum.It was added to the National Register of Historic Places in 2015.

Franklin Square Historic District is a national historic district located at Oswego in Oswego County, New York. The district includes 93 contributing buildings and one contributing site.It was listed on the National Register of Historic Places in 1982.

Nash is a World War II U.S. Army Large Tug (LT) seagoing tugboat built as hull #298 at Jakobson Shipyard, Oyster Bay, New York as a Design 271 steel-hulled Large Tug delivered in November 1943. Originally named Major Elisha K. Henson (LT-5), in 1946 she was renamed John F. Nash by the U.S. Army Corps of Engineers. Since retirement from the Corps of Engineers, LT-5 has been renamed Major Elisha K. Henson. As of the 1992 date of its listing as a National Historic Landmark, LT-5 was believed to be one of the last functional U.S. Army vessels that participated in Normandy landings.

The H. Lee White Marine Museum is located in Oswego, New York. It was founded in 1982 by Rosemary Sinnett Nesbitt (1924–2009), a local professor and the City of Oswego Historian. Nesbitt retired from directorship of the museum in 2008 after completing 25 years of service.It is the current home of the tugboat Nash, a National Historic Landmark, one of the few remaining US Army vessels from the Normandy Landings. Located at the museum is the Derrick Boat No. 8, added to the National Register of Historic Places in 2015.

Fort Oswego was an 18th-century trading post in the Great Lakes region in North America, which became the site of a battle between French and British forces in 1756 during the French and Indian War. The fort was established in 1727, on the orders of New York governor William Burnet, adjacent to a 1722 blockhouse that had originally been a way station for French traders. The log palisade fort established a British presence on the Great Lakes. In 1756, the fort's garrison of British soldiers from the 50th and 51st regiments were easily defeated by a combined French and Native American force. More than one hundred British soldiers were killed, many of them after the fort had been formally surrendered. The French took a further 1,500 British prisoners, and destroyed the fort itself. The site is now included in the city of Oswego, New York.

The Battle of Fort Oswego was one in a series of early French victories in the North American theatre of the Seven Years' War won in spite of New France's military vulnerability. During the week of August 10, 1756, a force of regulars and Canadian militia under General Montcalm captured and occupied the British fortifications at Fort Oswego, located at the site of present-day Oswego, New York. In addition to 1,700 prisoners, Montcalm's force seized the fort's 121 cannons. The fall of Fort Oswego effectively interrupted the British presence on Lake Ontario and removed it as a threat to the nearby French-controlled Fort Frontenac. The battle was notable for demonstrating that traditional European siege tactics were viable in North America when applied properly in the right circumstances and terrain.

Woodruff Block is a historic commercial building located at Oswego in Oswego County, New York. It is a four-story masonry structure built about 1840 and modified between 1900 and 1930. It features rectangular cut stone columns with Doric capitals in the Greek Revival style. When built it was located strategically at the terminus of the 1828 Oswego Canal.It was listed on the National Register of Historic Places in 1995.

Walton and Willett Stone Store, also known as the Cahill Building or Cahill's Fish Market, is a historic commercial building located in Oswego, New York. It is a three and four story, limestone structure with a distinctive stepped gable roof on the banks of the Oswego River. The oldest commercial building in the city of Oswego, it was built in 1828 and first used as a ship chandlery. In later years, it housed a newspaper office, customs collector, steamboat ticket and freight office, and warehouse. In 1945, it was purchased for use as a fish market.It was listed on the National Register of Historic Places in 1976. It was the site of Coleman's Irish Pub until 2008.In June 2014, the building was ruled "dangerous" by city codes officers citing structural concerns. In 2018, it was redeveloped and opened as seven luxury apartments, now called Cahill Landing. In 2019 the building received the Preservation League of New York State's Excellence in Historic Preservation award.