1848–1854
Texas, Maryland
Early Cockeysville marble facing over gneiss backing. Campbell Quarry marble specimen; not an identified monument block.2,8,21
Washington, D.C.
The Washington Monument
Built to honor George Washington and his central role in the nation’s founding and independence, the monument became a public undertaking in stone1,16. Built from about 36,000 stones and faced in marble from three documented sources over more than three decades, from 1848 to 1884, its construction traces a young nation growing alongside it1,4,6,7,8.
Claim Your Place In Its History.
- Choose an individual stone on the Washington Monument
- Register it in your name or dedicate it to someone special
- One stone, one registration, each stone can be claimed only once
- A limited number of stones, claim yours while it’s available
The National Idea
A Vision For A New Nation
Americans sought a memorial equal to Washington’s place in independence and the new republic. The Society formed in 1833, raised public subscriptions, and selected Robert Mills’s design three years later16,17.
Mills imagined an obelisk above a circular pantheon. Cost removed the pantheon; the shaft endured. Construction began in 1848, stopped for more than two decades, and resumed under federal engineers before completion in 18841,4.
Marble facing · joints, veining, weathered face
A Monument Written In Marble
The Stones That Built It
One shaft. Two building eras.
From a distance, the monument reads as one white form. Its exterior is a relatively thin marble facing over structural masonry: gneiss in the first campaign and granite in much of the resumed work2,5.
Work stopped in 1854 at about 152 feet. When federal engineers resumed construction, the original supply could not simply continue. A few Lee, Massachusetts courses bridged the work before Beaver Dam marble carried the shaft upward1,7,8. Different quarry beds and a quarter-century of unequal weathering made the seam visible.
The masonry is a visible record of interruption, material choice, engineering, and time.
Stone Sources & Timeline
A Closer Look
Why Does The Monument Change Color?
The line near 150 feet marks the long interruption. The lower stone had weathered for roughly twenty-five years before later marble was set. Different quarry beds, plus the narrow Lee interval, make the two construction eras legible on the exterior6,7,8.
Interpretive elevation · geometry after HABS DC-42814
Sources & Accuracy
References
Dimensions, quarry sources, course heights, and dates on this page are drawn from published Park Service, Library of Congress, USGS, and peer-reviewed sources, cited inline by number.
A stone-by-stone map of the exterior — the width and position of all 10,652 facing blocks in this registry — is not publicly documented. Those positions are reconstructed from documented course heights and the documented taper, and are labelled as reconstructed geometry rather than an as-built record.
- 1.National Park Service. Washington Monument Construction Timeline. Washington Monument, History & Culture.
- 2.National Park Service. A History of the Washington Monument, Chapter 2: Construction, First Phase, 1848–1856.
- 3.National Park Service. A History of the Washington Monument, Chapter 3: The Interim Period, 1856–1876.
- 4.National Park Service. A History of the Washington Monument, Chapter 4: Construction, Second Phase, 1876–1884.
- 5.John Milner Associates for the National Park Service. Washington Monument Historic Structure Report, Volume I. Denver Service Center / National Capital Region, June 2004.
- 6.National Park Service. Information Panel: Washington — The Man, The Monument, The City.
- 7.Joseph T. Hannibal and Lorraine Schnabel. Cockeysville marble: a heritage stone from Maryland, USA. Geological Society, London, Special Publications 486, 2020.
- 8.CAMEO, Museum of Fine Arts, Boston. Texas marble. after F. A. Lent, Trade Names and Descriptions of Marbles, 1925.
- 9.National Park Service. Washington Monument Memorial Stones. Visitor pamphlet.
- 10.Judith M. Jacob. The Washington Monument: A Technical History and Catalog of the Commemorative Stones. National Park Service, Northeast Region, 2005.