Structure

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Robertson Quarry Galamander (Hancock County, Maine)
Rocket Propulsion Test Complex (Hancock County, Mississippi)
Rose Bowl, The (Los Angeles County, California)
Saint Peter's Grotto (Hanson County, South Dakota)
San Jose Estates Gatehouse (Duval County, Florida)
Sargent House (Pike County, Ohio)
Once an Underground Railroad Station
Sargent's Pond (Norfolk County, Massachusetts)
Saturn V Dynamic Test Stand (Madison County, Alabama)
Saturn V Launch Vehicle (Harris County, Texas)
Rocket used in the Apollo space missions.
Saturn V Space Vehicle (Madison County, Alabama)
A fine example of the enormous vehicle that took Americans to the moon
Schulenburg Cotton Compress (Fayette County, Texas)
Shivar Springs Bottling Company Cisterns (Fairfield County, South Carolina)
Early 20th Century spring water bottling facility in Fairfield County, SC
Sinnott Memorial Building No. 67 (Klamath County, Oregon)
Skansie Brothers Park (Pierce County, Washington)
Small Heiau (Honolulu County, Hawaii)
Southeast Water Trough (Polk County, Iowa)
Southernmost Point Buoy (Monroe County, Florida)
The Southernmost point was originally just marked with a sign, which was often stolen. In response to this, the city of Key West erected the now famous concrete buoy in 1983.
Spacecraft Magnetic Test Facility (Prince George's County, Maryland)
Speakman No. 1 (Chester County, Pennsylvania)
Square Rock Dipping Vat (Scott County, Arkansas)
ST. NICHOLAS III (Sponge Diving Boat) (Pinellas County, Florida)
ST. NICHOLAS VI (Sponge Diving Boat) (Pinellas County, Florida)
Strap Iron Corral (Adams County, Washington)
Structure at 490 E. 200 North (Beaver County, Utah)
Stumphouse Tunnel Complex (Oconee County, South Carolina)
Planned tunnel (not completed) for the Blue Ridge and Atlantic Railroad
Substation #401 (Kings County, New York)
Substation 13 (New York County, New York)
Substation 17 (New York County, New York)
Substation 235 (New York County, New York)
Substation 409 (New York County, New York)
Substation 42 (New York County, New York)
Substation 7 (New York County, New York)
Sumner--White Dipping Vat (Ashley County, Arkansas)
Surface Creek Livestock Company Silos (Delta County, Colorado)
T. B. McCLINTIC (Brunswick County, North Carolina)
Texola Stone Jail (Beckham County, Oklahoma)
The Dutch Windmill (San Francisco County, California)
Topsham Fairgrounds Grandstand (Sagadahoc County, Maine)
Track Bus No. 19 (Mariposa County, California)
Tracy City Coke Ovens (Grundy County, Tennessee)
Turner Cattle Pound (Androscoggin County, Maine)
Twenty-Five Foot Space Simulator (Los Angeles County, California)
Village Park Bandstand (Waukesha County, Wisconsin)
Octagonal Bandstand with Lannon Stone Foundation
Virginia Beach Fishing Pier (Virginia Beach, Virginia)
Fishing Pier on the Atlantic Ocean in Virginia Beach, VA
W. O. DECKER (tugboat) (New York County, New York)
Waldoborough Town Pound (Lincoln County, Maine)
Washington Square (Philadelphia County, Pennsylvania)
Watervliet Side Cut Locks (Albany County, New York)
Weehaw Rice Mill Chimney (Georgetown County, South Carolina)
Wellsburg Wharf (Brooke County, West Virginia)
Willamette Falls Locks (Clackamas County, Oregon)
Wofford Lookout Complex (Otero County, New Mexico)
Woman's Community Club Band Shell (Cleburne County, Arkansas)
Wright Flyer III (Montgomery County, Ohio)
Yale Bowl (New Haven County, Connecticut)
Yulee Sugar Mill Ruins (Citrus County, Florida)
Zero Gravity Research Facility (B-2) (Cuyahoga County, Ohio)