Architecture, buildings, and civil works

Cornish–Windsor Covered Bridge

The Cornish–Windsor Covered Bridge is a 460-foot timber covered bridge built in 1866 over the Connecticut River between Cornish, New Hampshire, and Windsor, Vermont, the longest wooden bridge in the United States.

Corpus Agrimensorum Romanorum

The Corpus Agrimensorum Romanorum is a compilation of Latin treatises on Roman land surveying, preserved in a sixth-century manuscript, with Frontinus and Hyginus Gromaticus among its authors.

Corrosion inhibitor

A corrosion inhibitor is a chemical compound that, at low concentrations, slows metal corrosion, in civil engineering chiefly an admixture protecting steel reinforcement in concrete from chloride attack.

Corrugated galvanised iron

Corrugated galvanised iron, also called corrugated iron or corrugated steel, is sheet iron or steel rolled into a wavy profile and zinc-coated to resist rust, patented in 1829.

Corviale

Corviale is a public residential megastructure in southwest Rome: a concrete slab about one kilometer long, designed in 1972 by a team led by Mario Fiorentino, with first apartments delivered in 1982.

Corvin Castle

Corvin Castle, also known as Hunyadi or Hunedoara Castle, is a Gothic-Renaissance castle in Hunedoara, Transylvania, Romania, expanded by John Hunyadi and King Matthias Corvinus into one of Eastern Europe's largest medieval buildings.

Costain Group

Costain Group PLC is a British infrastructure solutions company founded in 1865, listed in London since 1943, whose projects include the Thames Barrier, the Channel Tunnel, and London Bridge station.

Cottage

Cottage: a small dwelling, historically a farm laborer's home, now also a modest house or vacation home. From Middle English cotage; distinct from the bungalow (Hindi bangla); central to English rural housing history and today's second-home and holiday-let markets.

Cotton mill

A cotton mill is a factory building where raw cotton is spun into yarn or woven into cloth, archetypal of the Industrial Revolution since Arkwright's Cromford mill of 1771.

Coulomb earth pressure theory

Coulomb earth pressure theory, formulated by Charles-Augustin de Coulomb in 1773, calculates the lateral force soil exerts on a retaining wall using a sliding wedge analysis.

Coupled shear wall

A coupled shear wall is a structural system of two or more reinforced concrete wall piers connected at each floor level by short, deep coupling beams.

Court House (near Stroud)

Court House (near Stroud): Grade I listed Jacobean house on Hale Lane, Painswick, Gloucestershire, rebuilt 1604 for Thomas Gardener, with a Court Room, C17 panelling, and a 1938 wing; distinct from Grade II Court Houses in Uley and Stroud.

Courtright Reservoir

Courtright Reservoir, also called Courtright Lake, is a reservoir in Fresno County, California, impounded by Courtright Dam and operated by PG&E as the upper reservoir of the Helms Pumped Storage Project.

Cove (architecture)

A cove, also known as coving or cavetto, is a concave molding fitted to the internal angle between two surfaces, typically where a wall meets a ceiling.

Coventry Cathedral

Coventry Cathedral, formally the Cathedral Church of Saint Michael, is the Anglican cathedral of Coventry, England, pairing a ruin bombed in 1940 with a modern cathedral consecrated in 1962.

Covered anaerobic lagoon

Covered anaerobic lagoon: an earthen waste-treatment basin with a flexible cover that traps biogas from anaerobic digestion of manure or wastewater. Also called covered lagoon digester (CLD); low-cost, unheated, suited to under-3%-solids liquid waste in warm climates.

Covered bridge

A covered bridge, also called a kissing bridge, is a timber-truss bridge with a roof and siding enclosing the roadway to protect the timbers from rot and weather.

Covered bridges in Canada

Covered bridges in Canada are timber truss bridges with roofs and siding; about 140 of an estimated 1,400 survive, mostly in Quebec and New Brunswick.

Covered bridges in Vermont

Covered bridges in Vermont, also listed as Vermont covered bridges, are roofed timber truss bridges built from 1820; about 100 survive, most still carrying road traffic.

Covered bridges of Ashtabula County, Ohio

The covered bridges of Ashtabula County, Ohio, are a cluster of 19 bridges, from an 18-foot span to the 613-foot Smolen–Gulf Bridge, the longest in the United States.

Covered bridges of Lancaster County, Pennsylvania

The covered bridges of Lancaster County, Pennsylvania, are roughly 28 surviving wooden, roofed truss bridges, mostly Burr arch trusses painted red; ten remain open to traffic under county ownership.

Covered bridges of Madison County, Iowa

The covered bridges of Madison County, Iowa, are six surviving wooden covered bridges, five originals built between 1868 and 1884 and one 2004 replica, in a county that once had nineteen.

Covered bridges of Parke County, Indiana

The covered bridges of Parke County, Indiana, are 31 surviving timber truss spans built from 1847 to 1920, nearly all on the National Register of Historic Places.

Covered bridges of the South, Appalachia and West

Covered bridges of the South, Appalachia and West surveys surviving timber-roofed bridges outside the East, including 17 in West Virginia, 6 in Tennessee, and 49 in Oregon.

Crac des Chevaliers and Qal’at Salah El-Din

Crac des Chevaliers and Qal'at Salah El-Din are two medieval Crusader-era castles in northwestern Syria, jointly inscribed as a UNESCO World Heritage Site in 2006.

Crane Bridge

Crane Bridge is a Grade I listed 15th-century stone bridge on Crane Street carrying the road across the River Avon in Salisbury, Wiltshire, with four splayed arches, four cut-waters, and an 1898 widening; list entry 1240793.

Créac'h Lighthouse

The Créac'h Lighthouse (French: phare du Créac'h) is an active lighthouse on the island of Ouessant in Brittany, France, first lit in 1863 and regarded as the most powerful in Europe.

Crescent City Connection

The Crescent City Connection, formerly the Greater New Orleans Bridge, is a pair of twin cantilever bridges carrying US 90 Business across the Mississippi River at New Orleans.

Crimean Bridge (Крымский мост)

The Crimean Bridge, also called the Kerch Bridge (Крымский мост), is a 19 km road-and-rail crossing of the Kerch Strait between Russia and Kerch in Crimea, opened in 2018.