Architecture, buildings, and civil works

Plastic hinge

A plastic hinge is a localized yielding zone in a structural member that rotates like a hinge at constant moment, underlying plastic analysis of steel and concrete frames.

Plate girder bridge

A plate girder bridge is a steel bridge supported by built-up I-shaped girders made from welded or riveted plates, widely used for spans of roughly 30 to 100 m.

Playboy Mansion

The Playboy Mansion, also known as Playboy Mansion West, is a Gothic Tudor estate in Holmby Hills, Los Angeles, Hugh Hefner's home and party venue from 1971 to 2017.

Plaza Hotel

The Plaza Hotel is a landmarked luxury hotel at 768 Fifth Avenue beside Central Park in Manhattan, opened in 1907 and designed by Henry Janeway Hardenbergh in the French Renaissance style.

Plenum (architecture)

A plenum is an enclosed, unoccupiable cavity in a building, such as above a suspended ceiling, that moves air as part of the HVAC air distribution system.

Plover Cove Reservoir (船湾淡水湖)

Plover Cove Reservoir (船湾淡水湖) is an impounding reservoir in northeastern Hong Kong, completed in 1968 as the world's first reservoir built in the sea and Hong Kong's second largest.

Plumber

A plumber is a tradesperson who installs, maintains, and repairs piping systems that carry water, gas, and waste. Most learn the trade through a 4- or 5-year paid apprenticeship.

Plumbing

Plumbing is the work or business of installing pipes, fixtures, and apparatus in buildings for bringing in water supply and removing liquid and water-borne wastes.

Plunge pool

A plunge pool is a basin that receives a free-falling jet from a dam spillway or outlet and dissipates its energy, protecting the riverbed from scour.

Pluvial flooding

Pluvial flooding, also called surface water flooding, happens when rainfall exceeds the infiltration capacity of soil or the capacity of drainage systems, producing overland flow and ponding.

Pochaiv Lavra

Pochaiv Lavra is a working Orthodox men's monastery in Pochaiv, Ternopil Oblast, Ukraine, founded in 1597 and known for the Pochaiv Icon of the Mother of God.

Podium

A podium is an architectural base: in classical usage the masonry platform under a temple, in modern usage the lower storeys of a tower set apart by form or use.

Poenari Castle

Poenari Castle, also known as Poenari Citadel, is a ruined medieval fortress in Argeș County, Romania, built in the 14th century and expanded by Vlad the Impaler.

Polavaram Project (పోలవరం ప్రాజెక్టు)

The Polavaram Project (పోలవరం ప్రాజెక్టు), also called Polavaram Dam, is a multi-purpose irrigation project under construction on the Godavari river at Polavaram in Andhra Pradesh, India.

Polder

A polder is low-lying land enclosed by dikes, with its water level controlled by sluices and pumping stations; polders cover roughly half the Netherlands, reclaimed since the 12th century.

Pondel

Pondel (Pont d'Aquel), a single-arch masonry aqueduct bridge in the Cogne Valley of Italy, was built in 3 BC and financed by Paduan entrepreneur Caius Avillius Caimus.

Pong Dam

Pong Dam, also called Beas Dam, is an embankment dam on the Beas River in Kangra district, Himachal Pradesh, India, completed in 1974 with a 396 MW powerhouse.

Pons Cestius (Ponte Cestio, Pons Gratiani), ancient Roman bridge linking Tiber Island to the right, Trastevere bank of the Tiber; built late 1st century BC by a Cestius, rebuilt 369-370 by Valentinian I, Valens, and Gratian, and re-erected 1888-1892.

Pons Chabinae

Pons Chabinae, the Roman bridge over the river Chabinas, today's Cendere Köprüsü or Severan Bridge in Adıyaman Province, Turkey; built by Legio XVI Flavia Firma under Septimius Severus, 120 m long with a 34.2 m arch.

Oct 20, 2026

Pons Fabricius

Pons Fabricius (Ponte Fabricio, Ponte dei Quattro Capi) is Rome's best preserved ancient bridge, built 62 BC by Lucius Fabricius to link the Tiber Island's left bank; still in pedestrian use.

Pont Alexandre III

Pont Alexandre III, or Alexander III Bridge, is an arch bridge over the Seine in Paris, built for the 1900 Exposition Universelle and named for Tsar Alexander III of Russia.

Pont de l'Alma

The Pont de l'Alma, or Alma bridge, is a road bridge over the Seine in Paris, whose Zouave statue serves as a traditional flood gauge.

Pont de Valmale

Pont de Valmale (Pont de la Combe de Valmale), a small Roman aqueduct bridge on the Nîmes aqueduct near the Pont du Gard in Gard, France; about 8 m high, built in petit appareil, its single arch lost, canal floor 0.40 m thick.

Oct 20, 2026

Pont del Diable (aqueduct)

The Pont del Diable, also called the Les Ferreres Aqueduct, is a Roman aqueduct bridge 4 km from Tarragona, Spain, built around the 1st century AD to carry water to Tarraco.

Pont des Arts

Pont des Arts, also called Passerelle des Arts, is a pedestrian footbridge over the Seine in Paris linking the Louvre with the Institut de France.

Pont du Diable (Céret)

Pont du Diable (Vieux Pont de Céret), Devil's Bridge: medieval single-arch stone bridge over the Tech at Céret, Pyrénées-Orientales, built 1321-1341, span 45.45 m, listed 1840, tied to a devil legend.

Pont du Diable, Hérault

The Pont du Diable (Devil's Bridge) is an early 11th-century Romanesque bridge over the Hérault river in Occitanie, France, built by the abbeys of Aniane and Gellone.

Pont du Gard

The Pont du Gard is a three-tiered Roman aqueduct bridge in southern France, built around AD 50 to carry water to Nîmes across the Gardon River.

Pont du Roi

Pont du Roi, officially Vieux pont sur la Doux, is a historic stone bridge over the Doux below Boucieu-le-Roi in the Ardèche, France, listed since 1927.