#underground chamber

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Workers Uncover an Underground Chamber Sealed for More Than a Century Near the National Mall https://www.smithsonianmag.com/smart-news/workers-uncover-an-underground-chamber-sealed-for-more-than-a-century-near-the-national-mall-180985018/

Workers Uncover an Underground Chamber Sealed for More Than a Century Near the National Mall

The dry cistern was discovered by construction crews working on the Smithsonian Castle’s renovation

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