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Fort Bridger
Fort Bridger, Wyoming trading post founded 1843 by Jim Bridger and Louis Vasquez on Blacks Fork; emigrant resupply point on the Oregon, California, and Mormon trails, later a Mormon way station and U.S. Army post until 1890, now a state historic site.
Fort Clatsop
Fort Clatsop: the Lewis and Clark Expedition's 1805-1806 winter fort on the Netul (Lewis and Clark) River near Astoria, Oregon; fifty feet square, seven rooms, given to Clatsop leader Coboway in March 1806.
Fort Cumberland
Fort Cumberland is an 18th-century bastioned fort at Eastney, Portsmouth, England, built from 1747 and rebuilt 1785–1812; the last fully bastioned fortress built in England, now Historic England's Fort Cumberland Laboratories heritage-science facility.
Fort Jefferson (Florida)
Fort Jefferson is the largest all-masonry 19th-century U.S. coastal fort, an unfinished hexagonal Third System fortress on Garden Key in Dry Tortugas National Park, about 70 miles west of Key West, used as a Civil War Union prison that held Dr. Samuel Mudd.
Fort Jesus
Fort Jesus, Mombasa: Portuguese fort built 1593-1596 to Giovanni Battista Cairati's Renaissance design, taken by Oman in 1698, later British prison, now a museum and UNESCO World Heritage Site in Kenya.
Fort Konstantin
Форт Константин (Fort Konstantin, Double Southern Battery): a Kronstadt coastal fort begun as a wooden battery in 1808, renamed 1834, armored from 1863, now a museum and recreation complex on Kotlin Island's dam.
Fort Mackinac
Fort Mackinac: British-built 1780 fort on Mackinac Island, Michigan, in the Straits of Mackinac; captured by the British in 1812, US national park headquarters 1875, decommissioned 1895, now a living history museum with 14 original buildings.
Fort Matanzas National Monument
Fort Matanzas National Monument preserves a Spanish coquina fort built 1740–1742 on Rattlesnake Island, Florida, guarding Matanzas Inlet, the backdoor to St. Augustine; it repelled Oglethorpe in 1742 and is reached by free NPS ferry.
Fort McPherson
Fort McPherson (Teetl'it Zheh) is a Gwich'in hamlet in the Northwest Territories on the Peel River, founded as an 1840 Hudson's Bay Company post, a national historic site, and site of the 1911 Lost Patrol.
Fort Michilimackinac
Fort Michilimackinac, also called Colonial Michilimackinac, was a French then British fort and fur-trade center at Mackinaw City, Michigan, built 1715, captured 1763, moved to Mackinac Island 1781, now reconstructed and excavated annually.
Fort Monroe National Monument
Fort Monroe National Monument, known as Freedom's Fortress, is a National Park Service unit in Hampton, Virginia, proclaimed in 2011 to preserve the moated fort where the 1861 Contraband Decision freed thousands of enslaved people.
Fort Pickens
Fort Pickens, a Third System masonry fort on Santa Rosa Island, Florida (1829–1834), defended Pensacola Bay, stayed Union-held through the Civil War, later held Geronimo, and is now in Gulf Islands National Seashore.
Fort Pitt
Fort Pitt, Chatham, Kent: early 19th-century bastioned fort defending Chatham Dockyard, begun 1805, named for William Pitt; later a major Army hospital and now a scheduled monument under a girls' grammar school.
Fort Point National Historic Site
Fort Point National Historic Site, also called the Fort at Fort Point, is a Third System brick seacoast fort in San Francisco built 1853-1861, the only such fort west of the Mississippi, garrisoned in the Civil War and preserved beneath the Golden Gate Bridge since 1970.
Fort Ross, California
Fort Ross, also known as Krepost Ross, is a former Russian-American Company settlement on the Northern California coast, founded in 1812 and now a state historic park.
Fort Santiago
Fort Santiago (Fuerte de Santiago) is a Spanish colonial fortress at the Pasig River mouth in Intramuros, Manila, built from 1571, rebuilt in stone 1589–1592, prison of Jose Rizal, WWII-damaged, now a National Shrine of Freedom.
Fort Shafter
Fort Shafter is the oldest U.S. Army installation in Hawaii, on Oahu near Honolulu, established 1907 and named for Maj. Gen. William R. Shafter. It hosts Headquarters, U.S. Army Pacific, IMCOM-Pacific, and the historic Palm Circle and Richardson Hall.
Fort Snelling State Park
Fort Snelling State Park: Minnesota state park at the Mississippi-Minnesota river confluence, opened 1962, over 400,000 annual visitors, 18 miles hiking trails, no camping, managed by Minnesota DNR.
Fort Stevens (Oregon)
Fort Stevens was a US Army coastal defense fort at the mouth of the Columbia River in Oregon, serving from the Civil War to World War II.
Fort Union National Monument
Fort Union National Monument, in Mora County, New Mexico, preserves three successive army forts (1851-1891) guarding the Santa Fe Trail, including the West's sole surviving earthen star fort and the largest visible Santa Fe Trail wagon ruts.
Fort Wayne Children's Zoo
Fort Wayne Children's Zoo (Fort Wayne Zoo since January 1, 2025), AZA-accredited zoo in Franke Park, Fort Wayne, Indiana; opened July 3, 1965 on 5.5 acres, now 47 acres with about 1,500 animals, self-funded by admissions and donations.
Fort Wetherill
Fort Wetherill is a former U.S. coastal defense fort on Conanicut Island, Jamestown, Rhode Island, now a 61.5-acre state park on granite cliffs overlooking Narragansett Bay, popular for scuba diving and harbor views.
Fort William, West Bengal
Fort William (Vijay Durg since 2025), Kolkata, West Bengal: East India Company fortress, old fort built 1696, captured by Siraj-ud-Daulah in 1756, new star fort completed 1773, now Indian Army Eastern Command headquarters.
Fort Yellowstone
Fort Yellowstone, at Mammoth Hot Springs in Yellowstone National Park, was the US Army post that headquartered the park's military administration from 1886 to 1918; it is now a National Historic Landmark District and park headquarters.
Fort Zeelandia (热兰遮城) (Taiwan)
Fort Zeelandia (熱蘭遮城), also called Anping Old Fort, was the VOC fortress at Anping, Tainan, Taiwan, built 1624–1634, seat of Dutch rule until Koxinga's 1662 conquest.
Forte Tiburtina
Forte Tiburtina (Forte Tiburtino), a Rome fortress built 1880–1884 on Via Tiburtina 780 as part of the Campo Trincerato's 15-fort ring; 23.8 ha, trapezoid plan, now hidden inside the Italian Army's Caserma Albanese Ruffo, decommissioned 1980.
Fortifications of Vauban
Fortifications of Vauban (Fortifications de Vauban), a French serial UNESCO World Heritage site inscribed in 2008: 12 groups of fortifications by Louis XIV's engineer Sébastien Le Prestre de Vauban along France's borders.
Fortifications on the Caribbean Side of Panama: Portobelo-San Lorenzo
Fortifications on the Caribbean Side of Panama: Portobelo-San Lorenzo, a serial UNESCO World Heritage Site (1980, in danger since 2012) of Spanish colonial forts around Portobelo Bay and San Lorenzo Castle on the Chagres River, Colón Province, Panama.
Fortress of Louisbourg
Fortress of Louisbourg National Historic Site: Parks Canada reconstruction in Nova Scotia of a French fortified town founded 1713, captured by Britain in 1745 and 1758, demolished, and partly rebuilt from 1961 as North America's largest historical reconstruction.
Fortuna Muliebris, T.
Fortuna Muliebris, the Roman "Fortune of women," was a goddess protecting married women, whose Via Latina temple tradition says matrons founded in 487 BC after Coriolanus lifted his siege.