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Battery Cheves (Charleston County, South Carolina)
Battery Gadsden (Charleston County, South Carolina)
Battery LeRoy (Charleston County, South Carolina)
Battery No. 1 (Charleston County, South Carolina)
Battery No. 5 (Charleston County, South Carolina)
Battery Osgood-Farley (Los Angeles County, California)
Former gun battery that protected the Los Angeles Harbor until World War II.
Battery Thomson (Charleston County, South Carolina)
Battery Tynes (Charleston County, South Carolina)
Battery White (Georgetown County, South Carolina)
Battery Wilkes (Charleston County, South Carolina)
Blockhouse Site (Polk County, North Carolina)
Bushy Run Battlefield (Westmoreland County, Pennsylvania)
Castle Clinton National Monument (New York County, New York)
Castle Pinckney (Charleston County, South Carolina)
Castle Williams (New York County, New York)
Columbus-Belmont Civil War State Park (Hickman County, Kentucky)
Commandant's Quarters (Wayne County, Michigan)
Cove Fort (Millard County, Utah)
El Pueblo (Pueblo County, Colorado)
Eli May House (Jefferson County, Wisconsin)
Flanders Callaway House (Warren County, Missouri)
Fort Ashby (Mineral County, West Virginia)
Built by George Washington in 1755.
Fort Assinniboine (Hill County, Montana)
Fort Atkinson (Washington County, Nebraska)
Fort Atkinson (Winneshiek County, Iowa)
Ruins of fort built to protect the Ho-Chunk (Winnebago)
Fort Baldwin Historic Site (Sagadahoc County, Maine)
Fort Barton Site (Newport County, Rhode Island)
Fort Belknap (Young County, Texas)
Fort Benton (Wayne County, Missouri)
Fort Boreman (Wood County, West Virginia)
Fort Brown (Cameron County, Texas)
Fort C.F. Smith (Warren County, Kentucky)
Fort Churchill (Lyon County, Nevada)
Fort Cobb Site (Caddo County, Oklahoma)
Fort Constitution (Rockingham County, New Hampshire)
Fort Craig (Socorro County, New Mexico)
Fort Crown Point (Essex County, New York)
Fort D (Cape Girardeau County, Missouri)
Site of a Civil War fort
Fort D Blockhouse (Cape Girardeau County, Missouri)
Replica stone blockhouse built as a Works Progress Administration project at the site of the Civil War Fort D
Fort Davis National Historic Site (Jeff Davis County, Texas)
Fort de Chartres (Randolph County, Illinois)
Fort Decker (Orange County, New York)
Fort Defiance Park (Defiance County, Ohio)
Fort Desoto Batteries (Pinellas County, Florida)
Fort Dobbs (Iredell County, North Carolina)
Fort Edgecomb (Lincoln County, Maine)
Fort Fisher (New Hanover County, North Carolina)
Fort Fizzle Site (Missoula County, Montana)
Fort Frederick State Park (Washington County, Maryland)
Fort Gaines (Mobile County, Alabama)
Fort Garland (Costilla County, Colorado)
Fort Gibson (Muskogee County, Oklahoma)
Fort Gorges (Cumberland County, Maine)
Fort Granger (Williamson County, Tennessee)
Civil War fort built by the Union Army
Fort Griswold (New London County, Connecticut)
Fort Halifax (Kennebec County, Maine)
Fort Hall Site (Bingham County, Idaho)
Fort Harmony Site (Washington County, Utah)
Fort Howell (Beaufort County, South Carolina)
Civil War Era Fort
Fort Independence (Suffolk County, Massachusetts)
Fort James Jackson (Chatham County, Georgia)
Fort Johnson/Powder Magazine (Charleston County, South Carolina)
Fort Knox State Park (Waldo County, Maine)
Fort Leaton (Presidio County, Texas)
Fort Leavenworth (Leavenworth County, Kansas)
Fort Ligonier (Westmoreland County, Pennsylvania)
Fort Lytle (Warren County, Kentucky)
Fort Mackinac (Mackinac County, Michigan)
Fort Macon (Carteret County, North Carolina)
Fort Marcy Ruins (Santa Fe County, New Mexico)
Fort Mason (Mason County, Texas)
Fort Site with Reconstructed Officer's Quarters
Fort Massac Site (Massac County, Illinois)
Fort Massachusetts (Harrison County, Mississippi)
Fort Matanzas National Monument (St. Johns County, Florida)
Fort McClary (York County, Maine)
Fort Mifflin (Philadelphia County, Pennsylvania)
Fort Monmouth Historic District (Monmouth County, New Jersey)
Fort Monroe (Hampton, Virginia)
Fort Moultrie (Charleston County, South Carolina)
Historic fort in Sullivan's Island, SC
Fort Nashborough (Davidson County, Tennessee)
Fort Negley (Davidson County, Tennessee)
Fort Nisqually Granary and Factor's House (Pierce County, Washington)
Fort Ontario (Oswego County, New York)
Fort Owen (Ravalli County, Montana)
Fort Palmetto (Charleston County, South Carolina)
Fort Pearce (Washington County, Utah)
Fort Phoenix (Bristol County, Massachusetts)
Fort Popham Memorial (Sagadahoc County, Maine)
Fort Pownall Memorial (Waldo County, Maine)
Fort Pringle (Charleston County, South Carolina)
Fort Raleigh National Historic Site (Dare County, North Carolina)
Fort Reno (Canadian County, Oklahoma)
Fort Ross (Sonoma County, California)
Fort Scammon (Kanawha County, West Virginia)
Fort Schuyler (Bronx County, New York)
Fort Snelling (Hennepin County, Minnesota)
A former military fortification located at the confluence of the Minnesota and Mississippi Rivers in Hennepin County, Minnesota.
Fort St. Frederic (Essex County, New York)
Fort St. John (Orleans Parish, Louisiana)
Fort Star (Livingston County, Kentucky)
Fort Stevens (Clatsop County, Oregon)
Fort Sumner ruins (De Baca County, New Mexico)
Fort Ticonderoga (Essex County, New York)
Fort Tompkins Quadrangle (Richmond County, New York)
Fort Toulouse (Elmore County, Alabama)
Fort Trenholm (Charleston County, South Carolina)
Fort Van Meter (Hampshire County, West Virginia)
Mid 18th Century Frontier Fort
Fort Vancouver National Historic Site (Clark County, Washington)
Fort Wallace Cemetery (Wallace County, Kansas)
Post cemetery for Fort Wallace
Fort Ward (Alexandria, Virginia)
Fort Washington (Middlesex County, Massachusetts)
Fort Washita (Bryan County, Oklahoma)
Fort Wayne (Wayne County, Michigan)
Fort Webb (Warren County, Kentucky)
Fort Western (Kennebec County, Maine)
Fort Wilkins (Keweenaw County, Michigan)
Fort William Henry (Lincoln County, Maine)
Fort Winnebago (Columbia County, Wisconsin)
One of three fortifications built by the army in Wisconsin along the river waterways.
Fort Zachary Taylor (Monroe County, Florida)
Garard's Fort (Greene County, Pennsylvania)
Grand Portage National Monument (Cook County, Minnesota)
Hedges-Lemen House (Berkeley County, West Virginia)
Homestead Manor (Williamson County, Tennessee)
Huff State Historic Site (32MO11) (Morton County, North Dakota)
Jocelyn Fort Site (Cumberland County, Maine)
Kern's Fort (Monongalia County, West Virginia)
La Purisima Mission (Santa Barbara County, California)
Mackinac Island (Mackinac County, Michigan)
Maxwell--Abreu and North (Martinez) Houses (Colfax County, New Mexico)
McIntire Garrison House (York County, Maine)
Mount Independence (Addison County, Vermont)
Old Fort Brady (Chippewa County, Michigan)
Old Point and Sebastian Rale Monument (Somerset County, Maine)
Old Rock House (McDuffie County, Georgia)
Old Spanish Fort (Jackson County, Mississippi)
Palace of the Governors (Santa Fe County, New Mexico)
Pipe Spring National Monument (Mohave County, Arizona)
Prickett's Fort (Marion County, West Virginia)
Royal Spring Park (Scott County, Kentucky)
Rufus Putnam House (Washington County, Ohio)
San Diego Presidio (San Diego County, California)
Site of Old Charles Towne (Charleston County, South Carolina)
Starved Rock (LaSalle County, Illinois)
A prominent rock formation along the south bank of the Illinois River.
Sutter's Fort (Sacramento County, California)
Tubac Presidio (Santa Cruz County, Arizona)
Unnamed Battery (Charleston County, South Carolina)
Unnamed Battery No. 1 (Charleston County, South Carolina)
Willtown Bluff (Charleston County, South Carolina)