Declassified spy technology has helped British archaeologists locate Roman walls that date to the second century A.D. in present-day Romania. Researchers from the University of Glasgow and and the University of Exeter used declassified photos taken during covert surveillance to identify previously unknown sections of the Roman wall. "Photographs from military surveillance are revealing more than those who took them could have imagined because now, half a century or more later, they are proving to be of enormous benefit in showing us our lost archaeological heritage," said the University of Exeter's Ioana Oltean.

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