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Pontpierre
Pontpierre: remains of a Roman bridge over the Eyrieux river at Saint-Fortunat-sur-Eyrieux, Ardèche, France; Barrington Atlas 17 D4, Pleiades 167873; also a Moselle commune and other French place names.
Pool of Siloam (בריכת השילוח)
The Pool of Siloam (בריכת השילוח), also called Siloam Pool, is an ancient water reservoir at the southern end of the City of David in Jerusalem.
Porcelain Tower of Nanjing (大报恩寺琉璃塔)
The Porcelain Tower of Nanjing (大报恩寺琉璃塔) was a nine-story glazed Buddhist pagoda at Nanjing's Great Bao'en Temple, built in the Ming dynasty and destroyed in 1856.
Porch
A porch, also called a sit-out, is a roofed, open-sided shelter projecting from a building's entrance; in America it peaked in the nineteenth century as an outdoor parlor.
Port Authority Building (Antwerp)
The Port Authority Building, known in Dutch as the Havenhuis, is the Zaha Hadid-designed headquarters of the port of Antwerp, Belgium, a diamond-shaped glass extension atop a restored historic fire station, opened in 2016.
Port Authority of New York and New Jersey
The Port Authority of New York and New Jersey, PANYNJ, is a bistate agency created in 1921 that runs the region's airports, bridges, tunnels, seaport, and PATH.
Port Everglades
Port Everglades (originally Lake Mabel) is a man-made deep-water seaport and inlet in Broward County, Florida, governed by Broward County as a self-funded enterprise. A top-three cruise homeport, leading container port, and South Florida's main energy seaport, with over $3 billion in planned 20-year investments.
Port of Antwerp-Bruges
Port of Antwerp-Bruges is a Belgian seaport formed in 2022 by merging the ports of Antwerp and Zeebrugge, Europe's second-largest port by cargo throughput after Rotterdam.
Port of Gdynia
The Port of Gdynia is a seaport on Gdańsk Bay in Gdynia, Poland, built from 1921 to give Poland its own harbor, becoming the largest on the Baltic within a decade.
Porta Maggiore
Porta Maggiore, also called Porta Prenestina, is a monumental double arch in Rome where the Aqua Claudia and Anio Novus aqueducts crossed two roads, built by Claudius in 52 CE.
Porta Tiburtina
Porta Tiburtina, also known as Porta San Lorenzo, is a gate in Rome's Aurelian Wall where the Via Tiburtina left the city, built around an Augustan arch of 5 BC that carried three aqueducts.
Portable water purification
Portable water purification, also known as point-of-use water treatment, is the treatment of drinking water away from a fixed supply, serving hikers, travelers, militaries, and emergency responders.
Portage Lake Lift Bridge
The Portage Lake Lift Bridge, officially the Houghton-Hancock Bridge, is a double-deck vertical-lift bridge completed in 1959 that carries US-41 and M-26 between Houghton and Hancock, Michigan.
Portal frame
A portal frame is a low-rise structural frame of columns and rafters joined by moment-resisting connections, spanning clear widths in warehouses and industrial buildings without internal bracing.
Portal method
The portal method is an approximate hand method of structural analysis, presented by A. Smith in 1915, that determines forces in building frames under lateral loads such as wind and earthquakes.
Portal North Bridge
The Portal North Bridge is a railroad bridge under construction over the Hackensack River in New Jersey, replacing the 1910 Portal Bridge as part of the Gateway Program.
Portcullis
A portcullis is a heavy grille of wood and metal, often weighing a tonne, lowered by chains from a chamber above to block a castle's gate passage.
Porter's Lodge
Porter's Lodge: name of gatehouse buildings at institution entrances, staffed by a porter. Notable examples include Portsmouth dockyard (1708), Winchester Close (Grade I, C15), and Trinity College, Cambridge (c. 1490).
Portico
A portico, plural porticoes, is an open structure with a roof supported by columns, built as an entrance to a large house or public building.
Porto City Hall
Porto City Hall, known in Portuguese as Câmara Municipal do Porto or Paços do Concelho, is the seat of Porto's municipal government, standing atop Avenida dos Aliados and inaugurated in 1957.
Portuguese fort at Ternate
The Portuguese fort at Ternate, the Fortaleza de São João Baptista, was a fortress built on Ternate in 1522 and captured by the Sultan in 1575.
Posey and Webster Street Tubes
The Posey and Webster Street Tubes are a pair of immersed vehicular tunnels carrying State Route 260 beneath the Oakland Estuary, linking Alameda with Oakland, California.
Post and lintel
Post and lintel, also called post and beam or trabeated, is a building system where upright posts carry horizontal lintels, the basis of Stonehenge and Greek temples.
Post-buckling analysis
Post-buckling analysis is a structural engineering method that traces a structure's equilibrium path beyond buckling, revealing limit loads and sensitivity to geometric imperfections in plates and shells.
Post-occupancy evaluation
Post-occupancy evaluation (POE) is the systematic assessment of how an occupied building performs and how occupants experience it, typically run 12 to 18 months after handover to inform operations and future design.
Post-tensioned concrete bridge
A post-tensioned concrete bridge is a concrete bridge whose superstructure is prestressed by steel tendons stressed with jacks after the concrete hardens, widely used in United States bridge building.
Post-tensioning
Post-tensioning is a method of prestressing concrete in which steel tendons are tensioned with jacks after the concrete has hardened, applying a permanent compression to it.
Post-Tensioning Institute
The Post-Tensioning Institute (PTI), founded in 1976 and based in Farmington Hills, Michigan, develops codes, specifications, and certification programs for post-tensioned concrete construction and co-wrote the ACI-PTI 320-25 building code.
Postmodern architecture
Postmodern architecture, or architectural post-modernism, is a style emerging in the 1960s against modernism, prevalent between about 1975 and 1990, known for ornament, historical reference, and symbolism.
Potable water reuse
Potable water reuse is the use of highly treated municipal wastewater as a drinking water source, either directly or after an environmental buffer such as an aquifer.