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Shwedagon Pagoda (ရွှေတိဂုံစေတီတော်)
Shwedagon Pagoda, also known as Shwe Dagon, is a 326-foot gilded Buddhist stupa on Singuttara Hill in Yangon, Myanmar, enshrining relics of four Buddhas including eight hairs of Gotama Buddha.
Shwesandaw Pagoda (Pagan)
Shwesandaw Pagoda (ရွှေဆံတော် ဘုရား) is a large Buddhist stupa at Old Bagan in Myanmar, built by King Anawrahta in 1057 after his conquest of Thaton.
Shwezigon Pagoda
Shwezigon Pagoda is a gilded Buddhist stupa at Nyaung-U, near Bagan, Myanmar, begun by King Anawrahta and completed by King Kyansittha in the late eleventh century.
Sichuan Road and Bridge Group
Sichuan Road and Bridge Group is a Chinese state-owned construction company headquartered in Chengdu, Sichuan, listed in Shanghai, one of China's largest road and bridge builders, with projects abroad.
Siddhivinayak Temple, Mumbai
Siddhivinayak Temple, also known as Shree Siddhivinayak Ganapati Mandir, is a Hindu temple dedicated to Ganesha at Prabhadevi in Mumbai, consecrated in 1801 and drawing more than 100,000 visitors daily.
Sidewalk Infrastructure Partners
Sidewalk Infrastructure Partners is a Brooklyn-based investment and development company, launched in 2019 by Alphabet and the Ontario Teachers' Pension Plan to invest in technology-enabled infrastructure projects and companies.
Siding (construction)
Siding, also known as wall cladding, is the exterior wall covering that sheds rain and protects a building's walls; common materials include wood, vinyl, and fiber cement.
Siegfried Line
The Siegfried Line, German Westwall, was a German fortification system along its western border, built mainly from 1938 to 1940 and breached by American forces in 1944.
Siena Cathedral
Siena Cathedral (Duomo di Siena) is a Romanesque-Gothic cathedral in Siena, Tuscany, banded in white and black marble and dedicated to the Assumption of Mary.
Siena Palazzo Pubblico
The Siena Palazzo Pubblico, also called Palazzo Comunale, is Siena's Gothic town hall on the Piazza del Campo, built between 1297 and 1310 and still the seat of municipal government.
Sight distance
Sight distance is the length of roadway ahead visible to a driver, measured along the line of sight; a controlling criterion of highway design with four AASHTO types: stopping, intersection, passing, and decision.
Sigma Plan
The Sigma Plan (Dutch: Sigmaplan) is a flood protection and nature restoration program of the Flemish government, launched in 1977 after the January 1976 storm surge floods along the tidal Scheldt in Belgium.
Sihanoukville Autonomous Port
Sihanoukville Autonomous Port (Khmer: កំពង់ផែស្វយ័តក្រុងព្រះសីហនុ), commonly abbreviated PAS, is Cambodia's only deep-sea commercial port, opened in 1960 and handling roughly three-quarters of national seaborne trade.
Silent Valley Reservoir
Silent Valley Reservoir is an impounding reservoir in the Mourne Mountains, County Down, Northern Ireland, built between 1923 and 1933 to supply water to Belfast.
Silica fume
Silica fume, also called microsilica, is an amorphous silicon dioxide by-product of silicon and ferrosilicon smelting used in concrete to raise strength, cut permeability, and improve durability.
Silk mill
A silk mill is a facility for processing silk thread into yarn or finished fabric, originating in water-powered Italian mills in the 13th century, like Lombe's Mill.
Silo
A silo, also called a grain silo, is a structure for storing bulk materials such as grain, silage, cement, and sand, in agriculture and industry.
Siloam tunnel
The Siloam tunnel, also called Hezekiah's tunnel, is a 533-meter rock-cut water tunnel in ancient Jerusalem, connecting the Gihon Spring to the Pool of Siloam.
Silver Bridge
The Silver Bridge, also called the Point Pleasant Bridge, carried US Route 35 over the Ohio River from 1928 until its 1967 collapse, which killed 46 people.
Silvertown Tunnel
The Silvertown Tunnel is a 1.4 km tolled twin-bore road tunnel under the Thames in east London, opened in April 2025 to relieve congestion at the nearby Blackwall Tunnel.
Simple suspension bridge
A simple suspension bridge is a bridge whose walkway lies on or between two sagging cables anchored at each end, without vertical suspenders, so it is restricted to pedestrians and suits difficult terrain.
Simplon Tunnel
The Simplon Tunnel is a 19.8 km twin-bore railway tunnel under the Alps linking Brig, Switzerland, with Iselle di Trasquera, Italy, opened in 1906 and long the world's longest.
Singapore Flyer
The Singapore Flyer is a giant observation wheel at Marina Bay in Singapore, 165 meters tall, which opened in 2008 and was the world's tallest observation wheel until 2014.
Singapore General Hospital
Singapore General Hospital (SGH), established in 1821, is the largest acute tertiary hospital in Singapore, with more than 50 clinical specialties on its Outram campus.
Singer Building
The Singer Building was an office skyscraper at Broadway and Liberty Street in Manhattan, designed by Ernest Flagg and the world's tallest building from 1908 to 1909.
Single-family detached home
A single-family detached home, also called a detached house, is a free-standing residence standing alone on its own lot, the dominant housing type in the United States.
Single-shield tunnel boring machine
A single-shield tunnel boring machine (single-shield TBM) is a hard-rock boring machine that thrusts against the segmental lining it erects, so boring and ring building alternate rather than overlap.
Sinhagad (सिंहगड)
Sinhagad (सिंहगड), formerly known as Kondhana, is a hill fortress in Maharashtra, India, about 35 km southwest of Pune, known for its 1670 recapture by Tanaji Malusare.
Sinking, joints and closure in immersed tube tunnels
Sinking, joints and closure in immersed tube tunnels covers how prefabricated tunnel elements are lowered onto the seabed, sealed with Gina and Omega gaskets, and closed at the final joint.
Siphon spillway
A siphon spillway is a closed conduit over a dam crest that passes flood water by siphonic action, with no moving parts and minimal rise in reservoir level.