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Old Bedford River
The Old Bedford River is a straight, 21-mile artificial drainage channel in the Fens of eastern England, cut between Earith and Salter's Lode and completed in 1637.
Old Blenheim Bridge
Old Blenheim Bridge was a wooden covered bridge with a 210-foot single span over Schoharie Creek in North Blenheim, New York, destroyed by flooding in 2011.
Old Customs Building, Mexico City
The Old Customs Building (Antigua Aduana de Santo Domingo) is an 18th-century baroque government building facing the Plaza de Santo Domingo in Mexico City's historic center.
Old Florida State Capitol
The Old Florida State Capitol, now the Florida Historic Capitol Museum, served as Florida's statehouse in Tallahassee from 1845 to 1977 and reopened in 1982 as a museum.
Old Hall
Old Hall, chiefly Langley Old Hall, Burnhope, County Durham: early 16th-century Scrope fortified manor house, now a moated ruin, scheduled monument NHLE 1002328; the name also covers several Grade II listed English houses.
Old London Bridge
Old London Bridge was the stone bridge across the Thames between the City of London and Southwark, completed in 1209 and standing for over 600 years until its demolition in 1831.
Old Rectory
Old Rectory is the shared name of many former Church of England rectory houses, mostly Grade I to II listed, from the mid-14th-century Warton ruin to the 1787 Old Rectory of Bedford County, Virginia.
Old River Control Structure
The Old River Control Structure, also called the Old River Control Complex, is a gated dam complex in Louisiana that keeps the Atchafalaya River from capturing the Mississippi.
Old South Church
Old South Church in Boston is a United Church of Christ congregation gathered in 1669, worshiping since 1875 in a Ruskinian Gothic church in Copley Square.
Old South Meeting House
The Old South Meeting House is a 1729 brick Puritan meeting house in downtown Boston, best known as the staging ground for the Boston Tea Party.
Old St Paul's Cathedral
Old St Paul's Cathedral was the medieval cathedral of the City of London, built between 1087 and 1314, gutted by the Great Fire of 1666 and replaced by Wren's cathedral.
Old St. Peter's Basilica
Old St. Peter's Basilica, begun under Constantine in the fourth century over the apostle Peter's tomb on the Vatican hill, served western Christendom for about 1,200 years before demolition.
Old Stock Exchange, Copenhagen
The Old Stock Exchange (Børsen) is a 17th-century Dutch Renaissance building on Slotsholmen in Copenhagen, built for King Christian IV and known for its dragon-tail spire.
Old Stone Church
The Old Stone Church is the historic First Presbyterian Church in Cleveland, Ohio, whose 1855 Romanesque Revival building is the oldest surviving building on Public Square.
Old Summer Palace
The Old Summer Palace, known in Chinese as Yuanmingyuan, was the Qing dynasty's principal imperial garden-palace compound in northwest Beijing, looted and burned by Anglo-French troops in October 1860.
Old Trafford
Old Trafford, known as the Theatre of Dreams, is a football stadium in Manchester, England, and home of Manchester United since its opening in 1910.
Olmsted Locks and Dam
Olmsted Locks and Dam is a US Army Corps navigation complex on the Ohio River near Olmsted, Illinois, opened in 2018 at a cost of about $3 billion.
Olympiastadion (Berlin)
Olympiastadion Berlin, also known as the Berlin Olympic Stadium, is a 74,475-seat stadium in Berlin, built for the 1936 Olympics and home of Hertha BSC.
OMA (architecture firm)
OMA (Office for Metropolitan Architecture) is an international architecture firm founded by Rem Koolhaas in 1975, known for the Seattle Central Library and CCTV Headquarters in Beijing.
Omkareshwar Temple
Omkareshwar Temple (ओंकारेश्वर) is a Hindu temple dedicated to Shiva on Mandhata island in the Narmada River, Madhya Pradesh, and is counted among the twelve Jyotirlingas.
One Canada Square
One Canada Square, also known as Canary Wharf Tower, is a 50-storey office skyscraper at Canary Wharf in London, designed by César Pelli and completed in 1991.
One Vanderbilt
One Vanderbilt, also known as One Vanderbilt Place, is a 1,401-foot (427-meter) supertall office skyscraper in Midtown Manhattan, opened in 2020 next to Grand Central Terminal.
One World Trade Center
One World Trade Center, also known as the Freedom Tower, is a 104-story, 1,776-foot skyscraper at the rebuilt World Trade Center site in Lower Manhattan, opened in 2014.
One57
One57, also known as Carnegie 57, is a 1,004-foot skyscraper at 157 West 57th Street in Midtown Manhattan, with luxury condominiums above a Park Hyatt hotel.
Onion dome
An onion dome, in Russian called луковичная глава, is a bulbous dome tapering to a point, first widely used in Islamic architecture and characteristic of Russian churches.
Oosterscheldekering
The Oosterscheldekering (Eastern Scheldt storm surge barrier) is a 9 km movable flood barrier in Zeeland, the largest of the Netherlands' Delta Works, opened in 1986.
Open (main beam) tunnel boring machine
An open (main beam) tunnel boring machine, or gripper TBM, is a shieldless hard-rock machine that advances by gripping the tunnel walls as its thrust base.
Open plan
An open plan is a floor layout where kitchen, dining, and living rooms flow together without walls, popularized by modernist architecture after World War II.
Open-face shield tunnelling
Open-face shield tunnelling is a method in which a rigid steel shield is pushed through soft ground with the tunnel face left unsupported, workers protected by boards, shelves, and hoods.
Operation Stack
Operation Stack is a Kent traffic procedure that closes the M20 to park freight lorries when disruption at Dover or the Channel Tunnel stops cross-Channel departures.