Titled “The Die Block in Marble, Colorado, March 1931,"
Titled “The Die Block in Marble, Colorado, March 1931," this block was later sculpted and is now resides at Arlington National Cemetery as the Tomb of the Unknowns. (Image provided by the National Archives)
A contractor applies a special mixture to cracks on
A contractor applies a special mixture to cracks on the surface of the Tomb of the Unknowns at Arlington National Cemetery, Va., in 2010. The repairs ultimately failed because of a technical problem with the mi... More
Amy Hollis, a contractor, applies a special mixture
Amy Hollis, a contractor, applies a special mixture to cracks on the surface of the Tomb of the Unknowns at Arlington National Cemetery, Va., in 2010. The repairs ultimately failed because of a technical proble... More
Contractors work to repair cracks on the surface of
Contractors work to repair cracks on the surface of the Tomb of the Unknowns at Arlington National Cemetery, Va., in 2010. Repairs to the Tomb of the Unknowns have taken place at night as not to disrupt the exp... More
Contractors work to repair cracks on the surface of
Contractors work to repair cracks on the surface of the Tomb of the Unknowns at Arlington National Cemetery, Va., in 2010. Repairs to the Tomb of the Unknowns have taken place at night as not to disrupt the exp... More
Contractors work to repair cracks on the surface of
Contractors work to repair cracks on the surface of the Tomb of the Unknowns at Arlington National Cemetery, Va., in 2010. Repairs to the Tomb of the Unknowns have taken place at night as not to disrupt the exp... More
Test channels with a mixture of lime, cement and crushed
Test channels with a mixture of lime, cement and crushed marble are compared to the crack in the stone in the Tomb of the Unknowns at Arlington National Cemetery, Va. The first cracks appeared shortly after ins... More
A Tomb Sentinel from the 3rd U.S. Infantry Regiment
A Tomb Sentinel from the 3rd U.S. Infantry Regiment pauses for 21 seconds before passing in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers i... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel guards the Tomb of the Unknowns in
A Tomb Sentinel guards the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to repair cracks in the stone at the tomb.
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to r... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the ... More
Robert Nieweg, director and regional attorney for the
Robert Nieweg, director and regional attorney for the National Trust for Historic Preservation Southern Field Office, prepares to discuss preservation efforts for the Tomb of the Unknowns. The tomb, which has c... More
Robert Nieweg, director and regional attorney for the
Robert Nieweg, director and regional attorney for the National Trust for Historic Preservation Southern Field Office, prepares to discuss preservation efforts for the Tomb of the Unknowns. The tomb, which has c... More
A sign at Arlington National Cemetery, Va., points
A sign at Arlington National Cemetery, Va., points the way to the Tomb of the Unknowns. Norfolk District, U.S. Army Corps of Engineers has partnered with the cemetery and other agencies to preserve the tomb by ... More
Test mixtures are shown in marble to simulate what
Test mixtures are shown in marble to simulate what they will look like when dry. A formula of lime, cement and crushed marble was developed to fill cracks in the stone at the Tomb of the Unknown at Arlington Na... More
A carefully measured ingredient sits ready to be used
A carefully measured ingredient sits ready to be used in a mixture that will be used to repair cracks in the Tomb of the Unknowns at Arlington National Cemetery. A mixture of lime, cement and crushed marble is ... More
A carefully measured ingredient sits ready to be used
A carefully measured ingredient sits ready to be used in a mixture that will be used to repair cracks in the Tomb of the Unknowns at Arlington National Cemetery. A mixture of lime, cement and crushed marble is ... More
Carefully measured ingredients sit ready to be used
Carefully measured ingredients sit ready to be used in a mixture that will be used to repair cracks in the Tomb of the Unknowns at Arlington National Cemetery. A mixture of lime, cement and crushed marble is us... More
A carefully measured ingredient sits ready to be used
A carefully measured ingredient sits ready to be used in a mixture that will be used to repair cracks in the Tomb of the Unknowns at Arlington National Cemetery. A mixture of lime, cement and crushed marble is ... More
Carefully measured ingredients sit ready to be used
Carefully measured ingredients sit ready to be used in a mixture that will be used to repair cracks in the Tomb of the Unknowns at Arlington National Cemetery. A mixture of lime, cement and crushed marble is us... More
Test mixtures are shown in marble to simulate what
Test mixtures are shown in marble to simulate what they will look like when dry. A formula of lime, cement and crushed marble was developed to fill cracks in the stone at the Tomb of the Unknown at Arlington Na... More
Test mixtures are shown in marble to simulate what
Test mixtures are shown in marble to simulate what they will look like when dry. A formula of lime, cement and crushed marble was developed to fill cracks in the stone at the Tomb of the Unknown at Arlington Na... More
The mixture used to fill the cracks in the stone at
The mixture used to fill the cracks in the stone at the Tomb of the Unknown must be the right mixture of lime, cement and crushed marble in order to bond to the stone. Here, ingredients in the mix are shown.
Amy Hollis, a conservator, mixes a formula used to
Amy Hollis, a conservator, mixes a formula used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partner... More
Amy Hollis, a conservator, mixes a formula used to
Amy Hollis, a conservator, mixes a formula used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partner... More
Amy Hollis, a conservator, mixes a formula used to
Amy Hollis, a conservator, mixes a formula used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partner... More
Amy Hollis, a conservator, fills a test channel with
Amy Hollis, a conservator, fills a test channel with a formula of lime, cement and crushed marble that will be used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Ceme... More
Amy Hollis, a conservator, fills a test channel with
Amy Hollis, a conservator, fills a test channel with a formula of lime, cement and crushed marble that will be used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Ceme... More
Amy Hollis, a conservator, fills a test channel with
Amy Hollis, a conservator, fills a test channel with a formula of lime, cement and crushed marble that will be used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Ceme... More
Shortly after it was installed in 1932, cracks first
Shortly after it was installed in 1932, cracks first appeared in the stone of the Tomb of the Unknowns at Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers has partnered with the c... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
The Old Guard's commander of the relief stands in front
The Old Guard's commander of the relief stands in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies ... More
A Tomb Sentinel from the Old Guard begins the Changing
A Tomb Sentinel from the Old Guard begins the Changing of the Guard ceremony in front of the Tomb of the Unknowns at Arlington National Cemetery. Norfolk District, U.S. Army Corps of Engineers has partnered wit... More
Tomb Sentinels from the Old Guard begins the Changing
Tomb Sentinels from the Old Guard begins the Changing of the Guard ceremony in front of the Tomb of the Unknowns at Arlington National Cemetery. Norfolk District, U.S. Army Corps of Engineers has partnered with... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel from the Old Guard passes in front
A Tomb Sentinel from the Old Guard passes in front of the Tomb of the Unknowns in Arlington National Cemetery, Va. Norfolk District, U.S. Army Corps of Engineers is working the cemetery and other agencies to re... More
A Tomb Sentinel from the Old Guard brings his heels
A Tomb Sentinel from the Old Guard brings his heels together to come to attention in front of the Tomb of the Unknowns at Arlington National Cemetery. Norfolk District, U.S. Army Corps of Engineers has partnere... More
A Tomb Sentinel from the Old Guard begins the Changing
A Tomb Sentinel from the Old Guard begins the Changing of the Guard ceremony in front of the Tomb of the Unknowns at Arlington National Cemetery. Norfolk District, U.S. Army Corps of Engineers has partnered wit... More
Col. Tori Bruzese, an Army engineer with Arlington
Col. Tori Bruzese, an Army engineer with Arlington National Cemetery, prepares for an interview to discuss repairs to the Tomb of the Unknowns. Norfolk District, U.S. Army Corps of Engineers has partnered with... More
Amy Hollis, a conservator and superintendent for work
Amy Hollis, a conservator and superintendent for work on the Tombs of the Unknown, talks about her role in repairs to the crack in the stone at the tomb. Norfolk District, U.S. Army Corps of Engineers has partn... More
“Taps played at Tomb of the Unknowns in Arlington National
“Taps played at Tomb of the Unknowns in Arlington National Cemetery, near Washington, D.C., on Armistice Day." Dated Nov. 11, 1921. (Image provided by the Office of History, U.S. Army Corps of Engineers)
Amy Hollis, a conservator, fills a test channel with
Amy Hollis, a conservator, fills a test channel with a formula of lime, cement and crushed marble that will be used to fill the cracks in the sculpted stone at the Tomb of the Unknown at Arlington National Ceme... More
“The Die Block Being Finished, Probably in Proctor
“The Die Block Being Finished, Probably in Proctor Vermont.” This block now resides at Arlington National Cemetery as the Tomb of the Unknowns. (Image provided by the National Archives)