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Archaeologists excavated the jail had to cope with groundwater that filled trenches as fast as they were dug. C. David M Doody / Courtesy Richmond City Council Slave Trail Commission Archaeologists ...

It seems, at first glance, an innocuous if enigmatic artifact, a copper medallion 1.5 inches square, rough-edged and engraved with the words "Charleston. 571. Porter. 1856." But the inscription—a city ...