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Silbury Hill
Silbury Hill is the largest man-made prehistoric mound in Europe, a chalk mound built near Avebury, Wiltshire, England, around 2470 to 2350 BC; its purpose is unknown.
Silent Sam
Silent Sam: Confederate monument at UNC-Chapel Hill, dedicated 1913, toppled by protesters in August 2018; nickname from the 1950s; Julian Carr's white-supremacist dedication speech and the voided 2019 SCV settlement define its history.
Silent Valley National Park
Silent Valley National Park, Kerala, India: a 237.52 sq km tropical evergreen rainforest in the Nilgiri Hills, saved from a hydroelectric dam by the Save Silent Valley movement, national park since 1984, core of the Nilgiri Biosphere Reserve.
Silk Road Dreamland
Silk Road Dreamland (方特丝路神画), or Fantawild Silk Road Dreamland, is a high-tech cultural theme park in Jiayuguan, Gansu, China, opened July 18, 2019 opposite Jiayuguan Pass, with 45 attractions themed on Silk Road and Great Wall culture.
Silk Roads: the Routes Network of Chang'an-Tianshan Corridor
Silk Roads: the Routes Network of Chang'an-Tianshan Corridor (UNESCO C 1442), inscribed 2014 by China, Kazakhstan, and Kyrgyzstan: a 5,000 km Silk Roads section with 33 sites from Chang'an/Luoyang to Zhetysu, used from the 2nd century BC to the 16th century.
Silk Roads: Zarafshan-Karakum Corridor
The Silk Roads: Zarafshan-Karakum Corridor is a UNESCO World Heritage property inscribed in 2023, with 34 component sites in Tajikistan, Turkmenistan, and Uzbekistan along an 866-kilometer Silk Roads route.
Silla Millennium Park
Silla Millennium Park (신라밀레니엄파크) is a closed Silla-history theme park in Gyeongju's Bomun Tourist Complex, South Korea. Opened March 30, 2007 after Sambu Construction's long-delayed project; famous for Queen Seondeok filming sets and Ragung hanok hotel; shut since about 2017 amid redevelopment disputes.
Sillian milestone
Sillian milestone: an uninscribed Roman milestone found in 1970 at Sillian (Silian), Tyrol, Austria, in the province of Noricum; it marks the 24th mile from Aguntum and is catalogued as CIL 17-04-01, 00161.
Silver Dollar City
Silver Dollar City is an 1880s-themed amusement park in Branson, Missouri, opened May 1, 1960 by the Herschend family atop Marvel Cave; named for silver dollars given as change, it draws over two million guests yearly.
Silver Falls State Park
Silver Falls State Park, Oregon's largest state park at over 9,000 acres near Salem, opened in 1933 and is known for the 7.2-mile Trail of Ten Falls, which passes ten waterfalls and runs behind four, including 177-foot South Falls.
Silver Lake Ranch
Silver Lake Ranch: ~54,000-acre former Moody Foundation ranch in Edwards and Kinney counties, Texas, acquired by TPWD in 2026 to become Silver Lake State Park, the state's second largest state park; unrelated namesakes exist in Slovakia and Nevada.
Simlipal National Park
Simlipal (Similipal) National Park, Mayurbhanj, Odisha, India: a 2,750 sq km tiger reserve, UNESCO biosphere reserve, and since April 2025 India's 107th National Park, known for wild melanistic black tigers and the Barehipani and Joranda waterfalls.
Simorgh Playground
Simorgh Playground (شهربازی سیمرغ) is a theme park in Semnan, Iran, within the 80-hectare Simorgh Park at the city's western entrance, offering rides, karting, a pool, boat rides, and lodging suites, open evenings 18:00–23:00; distinct from Simorgh parks in Isfahan, Kish, and Mazandaran.
Sîn temple (Khorsabad)
Sîn temple (Khorsabad): one of six sanctuaries on the palace terrace of Dur-Sharrukin, dedicated to the god Sin; built under Sargon II, excavated by the Oriental Institute 1932–33, with glazed-brick façade bricks now in Chicago.
Sîn-Šamaš Temple
Temple of Sin and Shamash at Assur, a double sanctuary to the moon and sun gods in Assyria's religious capital, built by Assurnirari in the 15th century BC, with symmetrical facing shrines; now almost disappeared.
Sinara
Sinara is a station on the Tabula Peutingeriana, the Roman road map, generally identified with Sinoria, Mithridates VI of Pontus' frontier fortress where he took refuge from Pompey in 66 BC.
SINCOHAB
SINCOHAB (Sindicato dos Trabalhadores Nas Empresas e Cooperativas Habitacionais e Desenvolvimento Urbano No Estado de Sao Paulo) is a Brazilian trade union founded August 1991 with CUT support, representing housing and urban development workers in São Paulo state, headquartered on Rua 7 de Abril, São Paulo.
Sindbad Land
Sindbad Land (مدينة أرض السندباد) is an amusement park in Baghdad, Iraq, opened 16 July 2015 in Zayouna on the former Al-Rusafa park site; 30 rides, a 250,000 m² lake, and the Aladdin Coaster.
Sindibad Amusement Park
Sindibad Amusement Park (Parc Sindibad), Casablanca's Aïn Diab theme park and zoo, Morocco's largest at ~32 ha; reopened 2015 with Compagnie des Alpes/Walibi involvement; Sindipark SA, 50% acquired by Pickalbatros in 2025.
Singapore Botanic Gardens
Singapore Botanic Gardens: 1859-founded tropical botanic garden, Singapore's first UNESCO World Heritage Site (2015), famed for Henry Ridley's rubber work, the National Orchid Garden, and an 800,000-specimen herbarium.
Singapore Oceanarium
Singapore Oceanarium (新加坡海洋生态馆), formerly S.E.A. Aquarium, is a large aquarium at Resorts World Sentosa, Singapore, opened 24 July 2025 after a threefold expansion, with 22 zones, AZA accreditation, and a solar-powered Research and Learning Centre.
Singraur Mound
Singraur Mound (Surya Bhita), ASI-protected ancient mound (N-UP-S14) at Singraur village, Soraon tehsil, Prayagraj, Uttar Pradesh; 18 ft high, protected 1920, near the excavated Sringaverapura site.
Sinharaja Forest Reserve (සිංහරාජ රක්ෂිතය)
Sinharaja Forest Reserve (සිංහරාජ රක්ෂිතය) is Sri Lanka's last viable primary lowland tropical rainforest, an 8,864-ha UNESCO World Heritage Site since 1988 with over 60% endemic trees and 19 of 20 endemic birds.
Sinnaneunsesang Folk Village
Sinnaneunsesang Folk Village (신나는세상민속촌) is a small theme park in Gwaebeop-dong, Sasang-gu, Busan, South Korea, registered as a business in October 1995, near Sasang station and the Busan Seobu intercity bus terminal.
Sînnicolaul Mare
Sînnicolaul Mare (Sânnicolau Mare, Nagyszentmiklós), a town in Timiș County, Romanian Banat, famed for the 1799 find of 23 gold vessels (about 10 kg, Avar-era, Kunsthistorisches Museum Vienna) and the multi-period Selişte archaeological site.
Sipia
Sipia was a Gallo-Roman relay station on the Tabula Peutingeriana, on the road between Condate (Rennes) and Juliomagus (Angers), probably near Visseiche, Ille-et-Vilaine, France; also a genus of antbirds.
Sir Seewoosagur Ramgoolam Botanical Garden
Sir Seewoosagur Ramgoolam Botanical Garden, also called Pamplemousses Garden, is Mauritius's oldest botanical garden, begun in 1736 as a vegetable garden and shaped by Pierre Poivre; famous for giant Victoria amazonica water lilies and palms.
Sirio
Sirio (Serione, Sirione) was a Roman road station in Gaul on the Burdigala–Aginnum road, 15–16 leagues from Bordeaux, near the Ciron–Garonne confluence; distinct from Siris of Magna Graecia and Sirino.
Sirocco Tower
Sirocco Tower is a 145-metre S&S Worldwide shot-and-drop tower at Six Flags Qiddiya City, Saudi Arabia, opened 31 December 2025; the world's tallest free-standing shot tower, dropping riders at close to 130 km/h.
Sirrin Biosphere Reserve
Sirrin Biosphere Reserve, also written Al-Sareen, is a UNESCO biosphere reserve in Oman's Eastern Hajar Mountains, nominated in 2025 to protect the endangered Arabian tahr.