Hall Of Records - Tunnel beside Mt.Rushmore with a titanium vault
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In 1938, Borglum and his crew began to carve this grand hall, where he envisaged the original Declaration of Independence and United States Constitution should eventually be stored. But a combination of unexpectedly hard granite, looming war in Europe, and lack of funding conspired against Borglum’s last dream, though his plans became more elaborate as his team rushed to complete this work. They had reached 70 feet into the granite by March 1941, when Borglum unexpectedly died. The monument was deemed complete and all work shut down on October 31 of the same year. Though Borglum’s children tried over the years to renew interest in their father’s last dream, it was not until 1998 that the National Park System, together with the Borglum Family, put “finishing touches” on the Hall of Records. A titanium vault was installed in the granite floor of the unfinished hall, and filled with 16 porcelain enamel panels that include the United States Constitution and other important historical documents. The Hall of Records entrance can be seen from west-facing aerial photographs of the monument.[4][5] @Curionic

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