Architecture, buildings, and civil works

Professional Engineer

A Professional Engineer (PE) is an engineer licensed by a government jurisdiction to prepare, sign, and seal engineering plans, a license created to protect public safety.

Professional Engineers Ontario

Professional Engineers Ontario (PEO) is the licensing and regulating body for professional engineering in Ontario, established in 1922 to serve and protect the public interest.

Progressive collapse

Progressive collapse is a structural failure mode in which an initial local failure, like loss of a column, spreads element to element, collapsing a building or disproportionately large part of it.

Sep 29, 2026

Progressive collapse analysis

Progressive collapse analysis is a structural engineering method that checks whether a building can absorb local damage, such as losing a column, without disproportionate collapse.

Progressive design–build

Progressive design–build (PDB) is a project delivery method in which an owner selects a design-builder on qualifications, then collaborates on scope and budget before the price is fixed.

Project Greek Island

Project Greek Island was the code name for a secret US government bunker built under the Greenbrier resort in West Virginia to house Congress during nuclear war.

Prophet's Mosque

The Prophet's Mosque (Al-Masjid an-Nabawi) is a mosque in Medina, Saudi Arabia, built by Muhammad in 622 and expanded under successive Islamic states into the second holiest site in Islam.

Proposed subsea strait crossings

Proposed subsea strait crossings are road or rail tunnel megaprojects beneath sea straits that were seriously studied but mostly never built, covering Fehmarnbelt, Gibraltar, Messina, and Bering; only the Fehmarnbelt immersed tunnel is under construction.

Proposed tunnels in Africa

Proposed tunnels in Africa are tunnel schemes still at the study or concept stage, led by the Morocco–Spain rail tunnel under the Strait of Gibraltar, jointly studied since 1980.

Prora

Prora, known as the "Colossus of Prora," is a 4.5-kilometer beach resort complex on Rügen's Baltic coast, built by the Nazi regime between 1936 and 1939.

Protected structure

A protected structure is an Irish building of special interest listed in a local authority's record of protected structures, protected under the Planning and Development Act 2000.

Pruitt–Igoe

Pruitt–Igoe was a large St. Louis public housing complex of 33 eleven-story towers, completed in 1954, designed by Minoru Yamasaki, and demolished beginning in 1972.

Pseudo-dynamic testing

Pseudo-dynamic testing is an earthquake engineering method in which inertia and damping are modeled numerically while the restoring force is physically measured from a test specimen, allowing full-scale seismic testing without a shake table.

Ptolemaios/Traianos Potamos

Ptolemaios/Traianos Potamos, also Diôrus, was the ancient Nile-to-Red-Sea canal through Egypt's Wadi Tumilat, begun under Necho II and Darius I, restored by Ptolemy II and reworked by Trajan (98–117 CE), and used in Roman Indo-Mediterranean trade.

PUB, Singapore's National Water Agency

PUB, Singapore's National Water Agency, formally the Public Utilities Board, is the statutory board managing Singapore's whole water cycle, supplying water through the Four National Taps, including NEWater, and handling flood and coastal protection.

Public Health Act

The Public Health Act 1848 was the first general English sanitation statute, creating a General Board of Health and local boards for water supply, sewerage, and drainage.

Public Health Act 1875

The Public Health Act 1875 was a United Kingdom Act that consolidated English sanitary law, made previously optional duties compulsory, and served as the main public health framework until 1936.

Public Health Act 1936

The Public Health Act 1936 is a United Kingdom Act that consolidated public health law for England and Wales, replacing about 600 sections with roughly 350.

Public library building

A public library building is a purpose-designed or adapted civic building housing a library open free to the public, a type spread by Andrew Carnegie's funding of 2,506 libraries and now guided by the IFLA-UNESCO Manifesto.

Public toilet

A public toilet, also called a public restroom or public washroom, is a toilet available to the general public in streets, parks, markets, and transit hubs.

Pueblo Grande Ruin and Irrigation Sites

Pueblo Grande Ruin and Irrigation Sites, or Pueblo Grande Museum Archaeological Park, is a National Historic Landmark in Phoenix, Arizona, preserving a Hohokam village and canals.

Puente de la Mujer

Puente de la Mujer (Spanish for "Woman's Bridge") is a cable-stayed swing footbridge over Dock 3 of Puerto Madero, Buenos Aires, designed by Santiago Calatrava and inaugurated in 2001.

Puente de Reparacea

Puente de Reparacea (Erreparazea): medieval single-arch stone bridge over the river Bidasoa at Oieregi, Bertizarana, Navarra, Spain; 22 m span, hump-backed profile, possibly Roman origin, declared Bien de Interés Cultural in 2009.

Puente del Bibey

Puente del Bibey (Ponte Bibei), a Roman three-arch granite bridge over the river Bibei between A Pobra de Trives (Ourense) and Quiroga (Lugo), Spain, built on the Via Nova, traditionally under Trajan, still carrying road OU-636 and declared a monument in 1931.

Oct 20, 2026

Puente Mayor del Tormes

Puente Mayor del Tormes (Puente Romano), Salamanca's Roman bridge of the 1st century AD on the Vía de la Plata: 26 arches, 15 Roman, about 350 m long, pedestrian since 1973.

Puente Nuevo

The Puente Nuevo ("New Bridge") is an 18th-century masonry bridge in Ronda, Spain, spanning the 90-meter-deep Tajo gorge to link the old town with the Mercadillo district.

Puente romano de Alconetar

Puente romano de Alconetar (Puente de Mantible): ruined Roman bridge over the Tajo at Garrovillas de Alconétar, Cáceres, on the Vía de la Plata; segmental-arch bridge of the 1st-2nd century AD, relocated stone by stone in 1969 when the Alcántara reservoir flooded its site.