Structure

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Powder Magazine (Scott County, Arkansas)
Pownal Cattle Pound (Cumberland County, Maine)
Promontory Butte Lookout Complex (Coconino County, Arizona)
Propulsion and Structural Test Facility (Madison County, Alabama)
PS Knoll Lookout Complex (Apache County, Arizona)
Puu o Mahuka Heiau (Honolulu County, Hawaii)
Quarry Limekiln (Houston County, Tennessee)
Reber Radio Telescope (Pocahontas County, West Virginia)
Redstone Test Stand (Madison County, Alabama)
Rickwood Field (Jefferson County, Alabama)
Rillito Racetrack--Chute (Pima County, Arizona)
Rittenhouse Square (Philadelphia County, Pennsylvania)
Rivervale Inverted Siphons (Poinsett County, Arkansas)
Roanoke Star (Roanoke, Virginia)
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 Clemente Pier (Orange County, California)
1,296' long wooden trestle pier built in 1985
San Jose Estates Gatehouse (Duval County, Florida)
Santa Monica Pier (Los Angeles County, California)
1,600-foot-long concrete pier built in 1909
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 13 (New York County, New York)
Substation 17 (New York County, New York)
Substation 235 (New York County, New York)
Substation 401 (Kings 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)
Trinidad Pier (Humboldt County, California)
520 foot wooden pier constructed in 1946
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)
Waverly Garage (Philadelphia County, Pennsylvania)
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)
Woodlawn Cemetery Gates and Shelter (Washington County, Iowa)
Wright Flyer III (Montgomery County, Ohio)
Yale Bowl (New Haven County, Connecticut)
Yreka Welcome Arch (Siskiyou County, California)
Yulee Sugar Mill Ruins (Citrus County, Florida)
Zero Gravity Research Facility (B-2) (Cuyahoga County, Ohio)