Workers have found at least 27 graves at the site of a construction project in downtown Charleston. The city is spending $142 million to renovate Gaillard Auditorium. But now workers have discovered more than two dozen graves and have more areas to search.

Officials are puzzled by the graves since there is no record of a cemetery at that location. Archaeologist Eric Poplin says it appears the pits date to at least 1780, the time of the American Revolution.

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