5,208 articles
Oppositions
Oppositions was an American architectural journal published in New York by the Institute for Architecture and Urban Studies from 1973 to 1984, in 26 issues.
Optina Pustyn
Optina Pustyn (Оптина пустынь) is a Russian Orthodox male monastery near Kozelsk, Kaluga Oblast, known in the 19th century for its elders and visitors like Dostoevsky and Tolstoy.
Orange County Groundwater Replenishment System
The Orange County Groundwater Replenishment System (GWRS) is a water purification project in Fountain Valley, California, opened in 2008 to recharge the groundwater basin and block seawater intrusion.
Orapa diamond mine
The Orapa diamond mine is an open-pit mine in Botswana's Central District, opened on 1 July 1971 as the country's first diamond mine, operated by Debswana.
Ordine degli Ingegneri
The Ordine degli Ingegneri (Order of Engineers) is the Italian professional order for engineers, a network of 106 provincial bodies that maintains the register of engineers and controls access to the profession.
Ordnance Survey
Ordnance Survey (OS), Great Britain's national mapping agency founded 21 June 1791 by the Board of Ordnance, maintains over 600 million geospatial features, the National Grid, and OSGB36 mapping data.
Oregon State Capitol
The Oregon State Capitol is the statehouse of Oregon in Salem, housing the legislature and governor's offices; the third capitol there, it was completed in 1938.
Øresund Bridge
The Øresund Bridge (Öresundsbron) is a combined railway and motorway link across the Øresund strait between Copenhagen, Denmark, and Malmö, Sweden, opened on July 1, 2000.
Organic architecture
Organic architecture is a philosophy of building, first named by Frank Lloyd Wright in 1914, that designs structures as one with their site, materials, and inhabitants, exemplified by Fallingwater.
Oriented strand board
Oriented strand board (OSB) is an engineered wood structural panel made of cross-oriented layers of strands bonded under heat and pressure, widely used in North American home construction as a plywood alternative.
Origins and architecture of the Taj Mahal
The Origins and architecture of the Taj Mahal, also called Architecture of the Taj Mahal, describes the mausoleum Shah Jahan built at Agra for Mumtaz Mahal, completed in 1648.
Oroville Dam
Oroville Dam is an earthfill dam on the Feather River in Butte County, California. At 770 feet (235 m) high, it is the tallest dam in the United States.
Oroville Dam crisis
The Oroville Dam crisis was a February 2017 emergency at Oroville Dam on the Feather River in California, in which spillway failures prompted the evacuation of about 188,000 people.
Orthotropic deck
An orthotropic deck, or orthotropic steel deck, is a lightweight steel bridge deck of rib-stiffened plate and floorbeams acting as one structure, developed in Germany in the 1930s for long-span bridges.
Orvieto Cathedral
Orvieto Cathedral (Italian: Duomo di Orvieto) is the Roman Catholic cathedral of Orvieto in Umbria, Italy, begun in 1290, a major example of Italian Romanesque-Gothic architecture with a mosaic-covered facade.
Osaka Castle (大坂城)
Osaka Castle, in Osaka, Japan, was begun in 1583 by Toyotomi Hideyoshi and fell to the Tokugawa in 1615; its 1931 concrete tower houses a museum.
Osborne House
Osborne House is a former royal residence in East Cowes on the Isle of Wight, built between 1845 and 1851 as a seaside retreat for Queen Victoria and Prince Albert.
Oscar Niemeyer
Oscar Niemeyer (1907–2012) was a Brazilian architect, a defining figure of Brazilian modern architecture, known for free-flowing concrete curves and for the principal buildings of Brasília, inaugurated in 1960.
Osgoode Hall
Osgoode Hall is a historic legal complex at Queen Street West in Toronto, home to Ontario's superior courts since 1846 and the Law Society of Ontario since 1832.
Osian temples
The Osian temples are a group of Hindu and Jain temples at Osian, near Jodhpur in Rajasthan, built between the 8th and 12th centuries and called the Khajuraho of Rajasthan.
Oslofjord Tunnel
The Oslofjord Tunnel (Oslofjordtunnelen) is a 7,306-meter subsea road tunnel on European route E134 under the Oslofjord in Norway, opened in 2000 as part of the Oslofjord Connection.
Ospedale degli Innocenti
The Ospedale degli Innocenti, or Hospital of the Innocents, is a former foundling hospital in Florence, Italy, begun in 1419 to a design by Filippo Brunelleschi.
Osterberg cell test
The Osterberg cell test, commonly called the O-cell test, is a deep foundation load test in which a sacrificial internal jack loads a pile from within.
Otford railway tunnel
The Otford railway tunnel, or Otford Tunnel, is a disused heritage-listed railway tunnel in New South Wales, opened in 1888 and closed to trains in 1920.
Ottoman aqueducts in the Balkans and Istanbul
Ottoman aqueducts are water-supply bridges and covered galleries built under Ottoman rule from the mid-sixteenth century onward, with the Kırkçeşme system, ordered by Süleyman the Magnificent in 1554, supplying Istanbul.
Ottoman architecture
Ottoman architecture, also called Ottoman Turkish architecture, is the building tradition of the Ottoman Empire, emerging in Bursa and Edirne and culminating in Sinan's 16th-century mosques.
Ouachita River Lock and Dam No. 8
Ouachita River Lock and Dam No. 8 was a movable-wicket lock and dam on the Ouachita River at Calion, Arkansas, built by the U.S. Army Corps of Engineers in 1907 and 1916.
Ouse Valley Viaduct
The Ouse Valley Viaduct, also called the Balcombe Viaduct, is a brick railway viaduct in West Sussex carrying the Brighton Main Line over the River Ouse.
Outer Ring Road, Pune
The Outer Ring Road, also called the Pune Ring Road, is a circular access-controlled expressway being built around Pune, India, with construction beginning in 2025.
Outhouse
An outhouse, also called an outside toilet or privy, is a small outdoor structure built over a pit that serves as a toilet for households without piped sewerage.