5,208 articles
Notre-Dame de Paris
Notre-Dame de Paris is a medieval Gothic cathedral on the Île de la Cité in Paris, begun in 1163 and the seat of the archbishop of Paris.
Notre-Dame du Haut
Notre-Dame du Haut, or Chapelle Notre-Dame du Haut, is a Roman Catholic pilgrimage chapel in Ronchamp, France, designed by Le Corbusier and built between 1950 and 1953.
Nottingham Cottage
Nottingham Cottage, nicknamed Nott Cott, is a two-bedroom house on the grounds of Kensington Palace in London and the first shared home of Prince Harry and Meghan.
Nottoway Plantation
Nottoway Plantation, also called Nottoway Plantation House, was a sugar plantation near White Castle, Louisiana, whose 1859 mansion was the largest surviving plantation house in the state until it burned in 2025.
Novgorod architecture
Novgorod architecture is the regional school of medieval Russian stone church building formed in Veliky Novgorod between the 11th and 15th centuries, beginning with St Sophia Cathedral and flourishing under the Novgorod Republic.
NRG Stadium
NRG Stadium is a retractable-roof stadium in Houston, Texas, home of the NFL's Houston Texans and the Houston Livestock Show and Rodeo, opened in 2002.
NRLA
The New Rail Link through the Alps (NRLA), also known as Alptransit, is a Swiss railway project comprising the Lötschberg, Gotthard, and Ceneri base tunnels, completed in 2020.
Nuevo Laredo
Nuevo Laredo is a city in Tamaulipas, Mexico, across the Rio Grande from Laredo, Texas. Founded in 1848, it anchors the busiest commercial crossing on the US–Mexico border.
Nurek Dam
The Nurek Dam, also known as Nurek Hydro-electric Station, is a 300-meter embankment dam on the Vakhsh River in Tajikistan, the tallest embankment dam in the world.
Nymphenburg Palace
Nymphenburg Palace (Schloss Nymphenburg) is a former summer residence of the Wittelsbach rulers of Bavaria, west of Munich, begun in 1664 and home to King Ludwig II's birthplace.
NZS 1170
NZS 1170 is the New Zealand structural design actions standard, a joint Australian/New Zealand series (AS/NZS 1170) specifying loads, wind, snow, and earthquake actions for building design.
NZS 3101
NZS 3101 is New Zealand's joint standard for the design of concrete structures, first issued in the early 1970s and internationally known for its earthquake capacity design provisions.
O'Shaughnessy Dam (California)
O'Shaughnessy Dam, known as the Hetch Hetchy dam, is a 430-foot dam on the Tuolumne River in Yosemite National Park, built by San Francisco for its water supply.
Oahe Dam
Oahe Dam is a large rolled-earth dam on the Missouri River north of Pierre, South Dakota, built by the U.S. Army Corps of Engineers and operating since 1962.
Oak Alley Plantation
Oak Alley Plantation is a historic former sugar plantation in Vacherie, Louisiana, known for its Greek Revival mansion and its double row of 28 live oaks.
Oast house
An oast house, also called a hop kiln, is an English farm building used for drying hops before they are sent to breweries, common in Kent and Sussex.
Octagon house
An octagon house is an eight-sided dwelling briefly popular in the United States and Canada in the 1850s, promoted by phrenologist Orson Squire Fowler's 1848 book.
Octávio Frias de Oliveira Bridge
The Octávio Frias de Oliveira Bridge, known locally as the Ponte Estaiada, is a cable-stayed bridge over the Pinheiros River in São Paulo, Brazil, opened in 2008.
Office du Niger
The Office du Niger, a semi-autonomous Malian state agency, administers one of West Africa's largest rice irrigation schemes, in the Ségou region, created by France in 1932.
Ofwat
Ofwat, formally the Water Services Regulation Authority, is the economic regulator of the water and wastewater sectors in England and Wales, established at privatization in 1989. It sets water companies' prices.
Oheka Castle
Oheka Castle, named for Otto HErmann KAhn, is a French-style chateau in Cold Spring Harbor, Huntington, New York, built by the financier between 1914 and 1919.
Ohio and Erie Canal
The Ohio and Erie Canal was a 308-mile waterway built by Ohio from 1825 to 1832, connecting Lake Erie at Cleveland with the Ohio River at Portsmouth.
Ohio River locks and dams
The Ohio River locks and dams are a chain of 19 navigation structures operated by the U.S. Army Corps of Engineers along 981 miles from Pittsburgh to Cairo, Illinois.
Ohio Statehouse
The Ohio Statehouse is the state capitol of Ohio on Capitol Square in Columbus, housing the General Assembly and governor's office in a Greek Revival building completed in 1861.
OHL (company)
OHL (Obrascón Huarte Lain, S.A.), known since 2021 as OHLA, is a Spanish construction and infrastructure group based in Madrid, tracing its origins to a Bilbao firm founded in 1911.
Okutadami Dam
Okutadami Dam is a 157 m concrete gravity dam on the Tadami River between Niigata and Fukushima, completed in 1960 and operated by J-POWER for hydropower.
Olarizuko urmaela
Olarizuko urmaela, the Olarizu pond, is a periodically flooded wetland in the Olarizu fields south of Vitoria-Gasteiz, Spain, created as a flood-retention basin in 2014.
Olba Aqueduct
Roman aqueduct of Olba (Ὤλβα), Uğuralanı, Rough Cilicia, Turkey; drew Lamas River water from Kızılgeçit at about 1,175 m and crossed Seytan Deresi on a two-tiered Severan bridge about 150 m long.
Old Alton Bridge
Old Alton Bridge, also known as Goatman's Bridge, is an iron Pratt through-truss bridge built in 1884 over Hickory Creek in Denton County, Texas, now open only to hikers and horseback riders.
Old Bailey
The Old Bailey, formally the Central Criminal Court, is a criminal courthouse in the City of London handling the most serious offenses, opened by King Edward VII in 1907.