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The Architect of the Capitol’s challenge is unique – maintaining aging, iconic buildings; adapting state-of-the-art technology; and increasing responsiveness to environmental, security and safety considerations in a rich historical setting.
The Architect of the Capitol's challenge is unique – maintaining aging, iconic...

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Groundbreaking at the Hart Senate Office Building.
As the country grows, so does the Capitol campus and, with it, the AOC's...
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Leave No Stone Unrestored

By Justin Kieffer

Stone preservation will continue to be a priority of the AOC as the best way to maintain the buildings across the Capitol campus is to constantly monitor them.

Condition of the stone on the Russell Building pre-restoration.
Molten cast iron heated to more than 2,500 degrees is poured into the mold.
April 10, 2015
Last week, I had an opportunity to travel to the foundry in Salt Lake City and see firsthand how the work to re-create decorative ornaments on the Dome is done.More »
June 26, 2015
The restoration of the Rotunda will ensure this hallowed space will be enjoyed by generations of visitors, staff and members of Congress for years to come.More »
July 18, 2016
When work on the bronze components and marble pedestals is completed this fall, viewers will again see the subtle details of the original sculpture.More »
December 15, 2016
Time has taken its toll on the Capitol's stone, but our preservation effort will restore even the finer details, hand-carved by artisans.More »
Photo of a worker in front of the kiosk.
October 9, 2015
The Cannon Renewal team explores a new way of viewing drawings in the field, bringing a 21st-century approach to field coordination and quality control as a model for the future of construction.More »
April 27, 2015
Because weather and time have not been kind to the Grant Memorial, AOC staff developed a preservation strategy to restore the Grant Memorial to its original condition.More »
2016 carved into a column capital during the Capitol Exterior Preservation project's stone work.
December 29, 2016
This past year has been filled with many sweet moments around the Capitol campus. Here are 10 that stand out.More »
Juan Sandoval and Jose Hernandez using a lewis to remove stones from Olmsted Terrace.
September 29, 2014
Addressing the stone pandemic across the Capitol campus takes a team of historic preservationists, structural engineers and stonemasons, among others. More »
AOC curator team at the foundry in Philadelphia.
January 7, 2016
On a recent visit to the foundry, members of the AOC Curator Division observed the casting process in action, including the dramatic moment when the molten bronze is poured.More »
Carving of a new rosette begun by a computerized numerical control (CNC) machine.
May 10, 2016
To answer this question, we travel to a brick building in Vienna, Virginia, where the hum of an industrial-sized machine is unmistakable. Littering the fenced-in courtyard of the building are massive slabs of stone of all shapes and colors.More »
A view of the renovated Bartholdi Park.
October 25, 2017
An in-depth summary of the recent Bartholdi Park renovation.More »
Tower crane being installed at the Cannon House Office Building.
April 21, 2015
High in the sky, about 50 feet above the roof, a crane is peeking out of the Cannon House Office Building. More »
View of the U.S. Capitol Dome with light in the windows
October 22, 2013
Architect of the Capitol Stephen T. Ayers, FAIA, LEED AP, reflects on the AOC's effort to restore the U.S. Capitol Dome.More »
April 5, 2016
By deploying this construction best practice, the Cannon Renewal Project will save a tremendous amount of natural resources, require less manpower and result in savings to the American taxpayer. More »
The scaffold for the Supreme Court's restoration is wrapped in a scrim enclosure printed with a full-size photograph of the building’s façade.
March 26, 2013
Take a look behind the scrim at the restoration work underway on the U.S. Supreme Court Building's West Front façade to address deterioration due to age, weather and nature. Take a look behind the scrim at the work. More »

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