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Mullaperiyar Dam (മുല്ലപ്പെരിയാർ അണക്കെട്ട്)
Mullaperiyar Dam (മുല്ലപ്പെരിയാർ അണക്കെട്ട്) is a masonry gravity dam on the Periyar river in Kerala, built 1887 to 1895 and operated by Tamil Nadu under a 999-year lease.
Multi-mode and convertible tunnel boring shields
A multi-mode or convertible tunnel boring shield is a tunnel boring machine that switches between open, EPB, and slurry modes in a single drive through alternating soft ground and rock.
Multi-stage flash distillation
Multi-stage flash distillation (MSF) is a thermal desalination process in which heated seawater flashes into vapor across low-pressure chambers, condensing as freshwater; dominant in the Arabian Gulf since 1960.
Multiple-arch dam
A multiple-arch dam is a concrete buttress dam in which thin arches span between buttresses, developed by John S. Eastwood from 1908 to save concrete.
Multiway switching
Multiway switching, known in the US as a three-way switch circuit, controls a single light from two or more locations, as in hallways and stairways.
Mumbai Trans Harbour Link
The Mumbai Trans Harbour Link, officially the Atal Bihari Vajpayee Sewri–Nhava Sheva Atal Setu, is India's longest sea bridge, connecting Mumbai with the mainland, opened in 2024.
Mundaring Weir
Mundaring Weir is a concrete gravity dam on the Helena River near Perth, Western Australia, built 1898 to 1901 as the headworks of the Goldfields Water Supply Scheme.
Mundeshwari Temple
The Mundeshwari Temple (मुण्डेश्वरी मंदिर) is an ancient octagonal Hindu temple on Mundeshwari Hill in Bihar, India, dating to 108 AD, dedicated to Shiva and the goddess Mundeshwari.
Muri Abbey
Muri Abbey (Kloster Muri) is a former Benedictine abbey in the canton of Aargau, Switzerland, founded in 1027 by Ita of Lorraine and Count Radbot of Habsburg.
Murrumbidgee Irrigation Area
The Murrumbidgee Irrigation Area is an irrigated agricultural region in the Riverina of southern New South Wales, Australia, established in 1906 and supplied from Burrinjuck Dam from 1909.
Murud-Janjira
Murud-Janjira, also known as Janjira Fort, is an island sea fort off Murud in Maharashtra, India, built and held by the Siddis and never captured by force.
Musterbauordnung
The Musterbauordnung (MBO), or Model Building Code, is a German model law adopted by the Bauministerkonferenz in 1960 as the template for the sixteen binding state building codes.
Mwea Irrigation Scheme
The Mwea Irrigation Scheme is Kenya's largest public rice irrigation scheme, a 30,600-acre paddy project in Kirinyaga County established in 1954 that supplies over 80% of Kenya's rice, fed by the Thiba and Nyamindi rivers.
Myrtles Plantation
Myrtles Plantation is a historic antebellum plantation house near St. Francisville, Louisiana, built in the 1790s and operated today as a bed and breakfast and ghost-tour destination.
Mysore Palace (ಮೈಸೂರು ಅರಮನೆ)
Mysore Palace, also known as the Amba Vilas Palace, is a royal residence in Mysuru, Karnataka, India, rebuilt in Indo-Saracenic style between 1897 and 1912.
Nabataean architecture
Nabataean architecture is the building tradition of the Nabataeans of Petra, Jordan, blending Hellenistic, Egyptian, and Assyrian forms with rock-cut tombs and advanced water systems.
Nachchaduwa Tank
Nachchaduwa Tank (Nachchaduwa Wewa, නාච්චාදූව වැව) is an ancient irrigation reservoir on the Malwathu Oya near Anuradhapura, Sri Lanka, attributed to Mahasena or Moggallana II, restored 1906 and 1958, irrigating about 2,540 ha.
Nagarjuna Sagar Dam
Nagarjuna Sagar Dam, also known as the Nagarjuna Sagar Project, is a masonry gravity dam on the Krishna River in India, completed in 1967 and irrigating about 900,000 hectares.
Nages Roman Bridge
Nages Roman Bridge (Pont d'Argnac), three-arch Roman bridge at Nages-et-Solorgues, Gard, France, still in service over the Rhôny on the ancient Nîmes-Lodève road; distinct from the 1960s concrete Pont du Viau at Nages, Tarn.
Nageshvara Jyotirlinga (नागेश्वर ज्योतिर्लिङ्ग)
Nageshvara Jyotirlinga (नागेश्वर ज्योतिर्लिङ्ग), also called Nageshwar or Nagnath, is one of the twelve Jyotirlingas of Shiva, with three claimed temples in Gujarat, Maharashtra, and Uttarakhand.
Nagoya Castle
Nagoya Castle (名古屋城) is a Japanese castle in Nagoya, Aichi Prefecture, begun in 1610 by Tokugawa Ieyasu and known for its golden roof ornaments; its original keep burned in a 1945 air raid.
Nahargarh Fort
Nahargarh Fort is an eighteenth-century hill fort on a ridge of the Aravalli Hills overlooking Jaipur, Rajasthan, built in 1734 by Maharaja Sawai Jai Singh II.
Nahrawan Canal
The Nahrawan Canal, also called Nahrwān or al-Qāṭul al-Kesrawi, was a large irrigation canal in Iraq attributed to Khosrow I that supplied eastern Abbasid Baghdad before failing around 1150.
Nail (fastener)
A nail is a straight, slender fastener, usually pointed and headed, driven by hammer or nail gun to hold two or more pieces of material together.
Nakagin Capsule Tower
The Nakagin Capsule Tower (中銀カプセルタワービル), a 1972 mixed-use residential and office tower in Ginza, Tokyo, was architect Kisho Kurokawa's leading built work of Metabolist capsule architecture.
Nam Theun 2 Hydropower Project
The Nam Theun 2 Hydropower Project (NT2) is a 1,080 MW dam in central Laos, built for $1.3 billion and exporting most of its power to Thailand.
Named tunnels: an overview
Named tunnels are specific, individually identified underground or underwater passages named after a place, engineer, or project, notable for length, age, engineering method, or cultural standing.
Nampo Dam (남포댐)
Nampo Dam, also called the West Sea Barrage, is an 8-kilometer tidal barrage in North Korea closing the Taedong River's mouth, built from 1982 to 1986.
Nanfang'ao Bridge (南方澳大桥)
Nanfangao Bridge was a 140 m single arch bridge crossing the Nanfangao fishing harbor channel in Yilan County, Taiwan; it collapsed in 2019, killing six.
Nanjing Yangtze River Bridge (南京长江大桥)
The Nanjing Yangtze River Bridge (南京长江大桥) is a double-deck road and railway bridge over the Yangtze at Nanjing, China, opened in 1968 as the first major bridge designed and built entirely by China.