Quantum Engineering Company has worked on many nationally registered historic landmarks. These landmarks are historic places that hold national significance. The Secretary of the Interior designates these places as exceptional because of their abilities to illustrate U.S. heritage. A full list can be found below:

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New York
Canfield Casino and Congress Park – Saratoga Springs, NY
Thomas Cole House – Catskill, NY
Dutch Reformed Church – Newburgh, NY
Montgomery Place – Annandale, NY
Samuel F.B. Morse House – Poughkeepsie, NY
New York State Capitol – Albany, NY
Philipsburg Manor – Upper Mills, NY
Sagamore Lodge – Long Lake, NY
Sunnyside – Westchester County, NY
Van Cortlandt Manor – Croton-on-Hudson, NY

Rhode Island
The Elms – Newport, RI
Governor Henry Lippitt House – Providence, RI
Newport Historic District – Newport, RI
 
Maryland
Maryland State House – Annapolis, MD

District of Columbia
Octagon House – Washington, DC

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Virginia (9)
Gunston Hall – Fairfax County, VA
Monticello – Albemarle, VA
Montpelier – Orange County, VA
Mount Vernon – Fairfax County, VA
Poplar Forest – Bedford County, VA
Stratford Hall – Westmoreland County, VA
University of Virginia, Historic District – Charlottesville, VA
George Washington’s Boyhood Home Site – Fredericksburg, VA

Vermont
St. Johnsbury Athenaeum – St. Johnsbury, VT
Vermont State Capitol – Montpelier, VT

Florida
Florida Southern College, Historic District – Lakeland, FL
Plant Hall (Formerly Tampa Bay Hotel) – Tampa, FL

Massachusetts
William Cullen Bryant Homestead – Cummington, MA
Emily Dickinson Home – Amherst, MA
Gore Place – Waltham, MA
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