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Ashfork-Bainbridge Steel Dam
The Ashfork-Bainbridge Steel Dam, also called the Ash Fork Steel Dam, is a steel dam built in 1898 near Ash Fork, Arizona, the first large steel dam in the world.
Ashlar
Ashlar is masonry of finely dressed rectangular stone blocks with thin, uniform joints; it is stronger and costlier than rubble masonry and used for building facades.
Ashtabula County, Ohio
Ashtabula County is a county on the southern shore of Lake Erie in northeast Ohio, the state's largest by area and its covered bridge capital.
Ashton Court
Ashton Court is an 850-acre Bristol country park and Grade I listed mansion at Long Ashton, a former Smyth family deer park with Repton landscaping, now owned by Bristol City Council and balloon fiesta venue.
Asphalt
Asphalt is a dark, cement-like material obtained from petroleum processing, in which bitumens predominate; it is used primarily for road construction, either as the binder in pavement mixtures or in refined products.
Asphalt shingle
An asphalt shingle is a lightweight roofing unit of asphalt-coated mat surfaced with mineral granules, the dominant roof covering on over 80 percent of US homes.
ASTM A615
ASTM A615/A615M is ASTM International's standard specification for deformed and plain carbon-steel bars used for concrete reinforcement, covering four yield-strength grades from 40,000 to 100,000 psi.
ASTM C150
ASTM C150/C150M, titled Standard Specification for Portland Cement, is the ASTM International standard setting chemical and physical requirements for portland cement in the United States, first issued in 1940.
Aston Hall
Aston Hall: Grade I listed Jacobean mansion in Aston, Birmingham, built 1618-1635 for Sir Thomas Holte, designed by John Thorpe; besieged 1643, later home of James Watt Jr, city-owned museum since 1864.
Asuka Itabuki Palace
Asuka Itabuki Palace (飛鳥板蓋宮, Asuka Itabuki no Miya) was Empress Kōgyoku's palace in Asuka, Nara Prefecture, and the site of the Isshi Incident of 645, which opened the Taika Reform.
Aswan Dam
Aswan Dam (Khazzān Aswān) denotes two Nile dams at Aswan, Egypt: the British-built 1902 Aswan Low Dam and the 1970 Aswan High Dam, a 111 m rock-fill embankment creating Lake Nasser, generating 10 billion kWh yearly and ending the Nile flood.
Aswan Low Dam
The Aswan Low Dam, also called the Old Aswan Dam or Assuan Dam, is a masonry buttress dam on the Nile at Aswan, Egypt, built between 1899 and 1902.
Atal Tunnel
Atal Tunnel, also called the Rohtang tunnel, is a 9.02 km highway tunnel in Himachal Pradesh, India, opened in 2020 beneath the Rohtang Pass to keep Lahaul connected year-round.
Atatürk Dam
Atatürk Dam (Atatürk Barajı) is a claycore rockfill dam and hydroelectric power station on the Euphrates River, serving as the centerpiece of the Southeastern Anatolia Project (GAP).
Atatürk Reservoir
Atatürk Reservoir (Atatürk Baraj Gölü) is the lake impounded by the Atatürk Dam on the Euphrates in southeastern Turkey, Turkey's third-largest lake after Van and Tuz.
Atchafalaya Basin Floodway System
The Atchafalaya Basin Floodway System is a system of levees and floodways in south-central Louisiana that carries a share of Mississippi River floodwater to the Gulf.
Athens Township, Bradford County, Pennsylvania
Athens Township is a second-class township in Bradford County, Pennsylvania, formed in 1797 on the New York state line, surrounding the boroughs of Athens, Sayre, and South Waverly.
Atlanta Motor Speedway
Atlanta Motor Speedway, renamed EchoPark Speedway in 2025, is a 1.54-mile banked quad-oval NASCAR track in Hampton, Georgia, opened in 1960 and hosting two Cup Series races yearly.
Atlantic Ocean Road
The Atlantic Ocean Road (Atlanterhavsvegen) is an 8.3 km scenic road in Møre og Romsdal, Norway, crossing eight bridges between Vevang and Kårvåg, opened in 1989.
Atlantropa
Atlantropa, first called Panropa, was a megaproject proposed by Hermann Sörgel from 1927 until his death in 1952 to dam the Mediterranean, generating vast hydroelectricity and new land.
Atmospheric water generator
An atmospheric water generator (AWG) is a device that extracts water vapor from air to make drinking water, by cooling air below its dew point or using desiccants.
Atomium
The Atomium is a 102-meter building in Brussels, Belgium, built as the flagship of the 1958 World's Fair and shaped as a magnified iron crystal unit cell.
Atrium (architecture)
An atrium is a large central hall or courtyard in a building, open to the sky or roofed with glazing, found in Roman houses and modern buildings.
Attic
An attic is the space directly below a building's roof and above the main occupied rooms, used for storage, insulation, building services, or, when finished, living space.
Auckland Harbour Bridge
The Auckland Harbour Bridge is a 1,020-meter steel bridge spanning the Waitematā Harbour in Auckland, New Zealand. Opened in 1959, it carries about 170,000 vehicles a day.
Auditorium
An auditorium is a room or building with tiered seating facing a stage, designed to give an audience good sightlines and sound for performances or lectures.
Audley End
Audley End: Jacobean mansion at Saffron Walden, Essex, built c1605-1614 for the 1st Earl of Suffolk on Walden Abbey's site; Capability Brown park, Robert Adam buildings, Grade I registered garden, English Heritage since 1948.
Augustus Pugin
Augustus Welby Pugin (1812–1852) was an English architect who led the Gothic Revival in Britain and designed most of the interiors of the Palace of Westminster.
Australia 108
Australia 108 is a 100-level residential skyscraper in Melbourne's Southbank, the tallest residential building in the Southern Hemisphere at 319 m with 1,105 apartments and a golden Starburst honoring the Commonwealth Star.
Australian Bridge Design Standard AS 5100
AS 5100, titled Bridge design, is the only Australian standard specific to bridges, covering their design, assessment, rehabilitation, and strengthening; it is maintained by Standards Australia committee BD-090.