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Grand Palais
The Grand Palais, also known as the Grand Palais des Champs-Elysées, is a Beaux-Arts exhibition hall in Paris built for the 1900 Exposition Universelle, now hosting major art exhibitions and cultural events.
Grand Union Canal
The Grand Union Canal is the longest canal in the United Kingdom, running 137 miles with 158 locks from the Thames at Brentford, London, to Birmingham.
Grande Arche
The Grande Arche, officially Grande Arche de la Fraternité, is a monumental hollow cube at La Défense on the western edge of Paris, inaugurated by President François Mitterrand in 1989.
Grande Chartreuse monastery
The Grande Chartreuse is the mother house of the Carthusian Order, a monastery of hermit monks founded by Bruno of Cologne in 1084 in the French Alps near Grenoble.
Granular activated carbon adsorption
Granular activated carbon adsorption is a water treatment process in which dissolved contaminants attach to porous carbon granules with surface areas of about 1,000 square meters per gram.
Gravity dam
A gravity dam is a dam that resists water pressure by its own weight, typically built as a straight wall of mass concrete on a rock foundation.
Grease trap
A grease trap, also called a grease interceptor, is a plumbing device that removes fats, oils, and grease from kitchen wastewater before it reaches the sewer.
Great Ballcourt of Chichén Itzá
The Great Ballcourt of Chichén Itzá (Gran Juego de Pelota) is the largest known Mesoamerican ballcourt, built at Chichén Itzá in Yucatán, Mexico, and famous for its whispering acoustics.
Great Belt East Bridge
The Great Belt East Bridge is a Danish suspension bridge carrying the motorway between Zealand and Funen, opened in 1998 with the Great Belt Link.
Great County Adit
The Great County Adit, also called County Adit, is a branching mine drainage tunnel network in Cornwall, begun in 1748, draining mines around Gwennap, Redruth, and St Day.
Great Hall of the People (人民大会堂)
The Great Hall of the People, also known as Renmin Dahuitang, is a government building on Tiananmen Square in Beijing, built in 1959 as one of the Ten Great Buildings.
Great Istanbul Tunnel
The Great Istanbul Tunnel, also called the Grand Istanbul Tunnel, is a proposed three-level road-and-metro tunnel under the Bosphorus in Istanbul, announced in 2015 as the city's third strait crossing.
Great Lakes Waterway
The Great Lakes Waterway is the locks, canals, rivers, and lakes linking the Atlantic to Lake Superior, including the St. Lawrence Seaway, Welland Canal, and Soo Locks, with 15 Seaway-size locks and a late-March-to-late-December season.
Great Living Chola Temples
The Great Living Chola Temples are a UNESCO World Heritage Site of three 11th- and 12th-century Hindu temples in Tamil Nadu, India, all still in worship.
Great Man-Made River
The Great Man-Made River, or Great Man-Made River Project, is a Libyan network of pipelines carrying fossil groundwater from Saharan aquifers to northern coastal cities and farmland.
Great Mississippi Flood of 1927
The Great Mississippi Flood of 1927 was the most destructive flood in United States history, inundating about 27,000 square miles and leaving over 700,000 homeless.
Great Mosque of Central Java
The Great Mosque of Central Java (Masjid Agung Jawa Tengah) is Central Java's largest mosque, in Semarang, Indonesia; completed in 2006, it holds 16,000 worshippers.
Great Mosque of Demak
The Great Mosque of Demak (Masjid Agung Demak) is a 15th-century mosque in Demak, Central Java, traditionally regarded as the oldest mosque in Java and tied to the Demak Sultanate.
Great Mosque of Divriği
The Great Mosque of Divriği (Divriği Ulu Camii) is a 13th-century mosque and hospital complex in Divriği, Turkey, built in 1228–29 and listed by UNESCO in 1985.
Great Mosque of Djenné
Great Mosque of Djenné, Mali: world's largest mud-brick building, a Sudano-Sahelian mosque completed 1907 on a 13th-century site, replastered annually at the Crépissage festival; World Heritage in Danger since 2016.
Great Mosque of Samarra
The Great Mosque of Samarra (جامع المتوكل), or Jami' al-Mutawakkil, is a ninth-century Abbasid congregational mosque in Samarra, Iraq, once the largest mosque in the world.
Great room
A great room is a large, open living space in a house that combines the family room, living room, and kitchen or dining area, with raised ceilings.
Great Seto Bridge
The Great Seto Bridge (瀬戸大橋, Seto Ōhashi) is a 13.1 km series of six double-deck bridges carrying road and rail across the Seto Inland Sea between Honshu and Shikoku in Japan.
Great Stink
The Great Stink was the 1858 episode when hot weather made sewage smells from the Thames unbearable in London, prompting Parliament to fund a new sewer system.
Greek Revival architecture
Greek Revival architecture, also known as the Greek Revival style or Doric Revival, is an architectural style modeled on ancient Greek temples, dominant in the United States from about 1820 to 1860.
Green building
Green building, also known as sustainable building or green construction, is the practice of creating structures that are environmentally responsible and resource-efficient throughout a building's life cycle.
Green Dome (القبة الخضراء)
The Green Dome (القبة الخضراء) is the green dome over the graves of Muhammad, Abu Bakr, and Umar at the Prophet's Mosque in Medina, built in 1279.
Green infrastructure (stormwater)
Green infrastructure for stormwater management uses plant and soil systems, permeable surfaces, and landscaping to store, infiltrate, or evapotranspirate stormwater, reducing flows to sewer systems and surface waters.
Green roof
A green roof, also known as a living roof or eco-roof, is a building roof covered with vegetation planted in engineered growing medium over waterproofing, drainage, and root-barrier layers.
Green Star (building rating system)
Green Star is an Australian sustainability rating and certification system for buildings, interior fitouts, and communities, administered by the Green Building Council of Australia since 2003, with more than 7,500 projects certified.