Robert C. McEwen United States Custom House

The Oswegatchie River is a 137-mile-long (220 km) river in northern New York that flows from the Adirondack Mountains north to the Saint Lawrence River. The Oswegatchie River begins at Partlow Lake in Hamilton County, New York. The river continues through Cranberry Lake which was 'doubled in size' through construction of a dam in the late 1860s. The river continues from the dam to Gouverneur, to near Talcville in St. Lawrence County, where it joins the West Branch. Much of it is within Adirondack State Park. The city of Ogdensburg developed at the mouth of the river at its confluence with the St. Lawrence.

The Fort de La Présentation (French pronunciation: [fɔʁ də la pʁezɑ̃tasjɔ̃]; "Fort of the Presentation"), a mission fort, was built in 1749 and so named by the French Sulpician priest, Abbé Picquet. It was also sometimes known as Fort La Galette (French pronunciation: [fɔʁ la galɛt]). It was built at the confluence of the Oswegatchie River and the St Lawrence River in present-day New York. The French wanted to strengthen their alliance with the powerful Iroquois, as well as convert them to Catholicism. With increasing tensions with Great Britain, they were concerned about their thinly populated Canadian colony. By 1755 the settlement included 3,000 Iroquois residents loyal to France, in part because of the fur trade, as well as their hostility to encroachment by British colonists in their other territories. By comparison, Montréal had only 4,000 residents.In 1758, with the Seven Years' War intensifying, a French-Canadian military commander took charge of a garrison at the fort. In 1759, French military forces abandoned the fort to move to Fort Lévis. Ultimately the British besieged that fort and Montréal. After the British victories of 1760, the French ceded their Canadian territory to Great Britain. The British renamed it Fort Oswegatchie. It remained under their control until 1796, after Jay's Treaty, when redefinition of the northern boundary caused the land to be taken over by the United States. The first settlement under an American flag began that year. American residents named the town Ogdensburg after early settler Samuel Ogden.

The Frederic Remington Art Museum is an art museum in Ogdensburg, New York, that focuses on the work of Frederic Remington.

The Library Park Historic District is a national historic district located at Ogdensburg in St. Lawrence County, New York. The district includes seven contributing buildings, one contributing site, and one contributing object. They include the Remington Art Museum (1809–10), Ogdensburg Public Library (1810), Library Park, and The Soldiers and Sailors Monument.It was listed on the National Register of Historic Places in 1982.

Acker and Evans Law Office (also known as Ogdensburg Bank) is a historic office building in Ogdensburg, New York, United States. It is a rectangular Greek Revival style structure with a facade of smooth-faced, locally quarried white marble. It was built about 1830 as a bank, then used as a ticket agency, insurance office, express office, and finally as a law office.It was listed on the National Register of Historic Places in 1983.

Ogdensburg Harbor Light is a privately owned lighthouse on the St. Lawrence River, listed on the National Park Service's Maritime Heritage Program as Lighthouse to visit. and as one of New York's Historic Light Stations. In 2016 it was listed on the National Register of Historic Places.

Judge John Fine House is a historic home located at Ogdensburg in St. Lawrence County, New York. It is a 2-story, three-bay Greek Revival-style residence appended to an earlier 1+1⁄2-story rear wing, built about 1823. Both sections are built of local blue limestone and feature gabled roofs.It was listed on the National Register of Historic Places in 1986.

U.S. Post Office-Ogdensburg is a historic post office building located at Ogdensburg in St. Lawrence County, New York. It was designed and built in 1867–1870, and is a two-story structure of regular ashlar stone blocks measuring 120 feet by 60 feet. It originally featured an octagonal domed cupola, but that was removed in 1906. It was designed by the Office of the Supervising Architect of the Treasury Department under Alfred B. Mullett. In 2009, the United States Congress enacted legislation renaming the building the Frederic Remington Post Office Building, in honor of painter Frederic Remington, who spent his formative childhood years in that city. It was listed on the National Register of Historic Places in 1977.

New York State Armory , also known as "The Arsenal," is a historic National Guard armory building located at Ogdensburg in St. Lawrence County, New York. It is a rectangular, two story structure built of ransom ashlar block with central pavilions projecting on its north and south elevations. The main facade features a central pavilion with a tower rising above the roofline and terminating in a corbeled and crenellated parapet. It was designed by noted Syracuse architect Horatio Nelson White. The building ceased being used by the State militia in 1873 and used by the city of Ogdensburg into the 1960s. It was listed on the National Register of Historic Places in 1976.The Armory is still owned by NY state and is still occupied by the 2-108th Infantry Battalion, New York Army National Guard. The city of Ogdensburg does not have any responsibility or use of this building unless approved by NY state.

The Oswegatchie Pumping Station is a pumping station on the Oswegatchie River at Ogdensburg in St. Lawrence County, New York. It was built in 1868 of random ashlar limestone. It is a two-story fortress like structure which features engaged tower projections at each of its four corners.It was listed on the National Register of Historic Places in 1990.

Ogdensburg Armory is a historic National Guard armory building located at Ogdensburg in St. Lawrence County, New York. It was built in 1898 and designed by State architect Isaac G. Perry. It consists of a 2-story, hip-roofed administration building and a large gable-roofed drill shed. It is built of load-bearing, reddish-brown Potsdam sandstone walls built upon a raised, rusticated, light-gray limestone foundation. The main block features 5-, 4-, and 3+1⁄2-story towers.It was listed on the National Register of Historic Places in 1995.

St. Mary's Cathedral is a Catholic cathedral located in Ogdensburg, New York, United States. It is the seat of the Diocese of Ogdensburg. St. Mary's parish was founded in 1827. The original St. Mary's Cathedral was located at Montgomery and Franklin Streets. The cornerstone was laid in 1855 and it was destroyed in a fire on November 25, 1947. The current cathedral was completed in 1952 and consecrated on October 22 of that year.