Rafał Proszowski and Mariusz Lampa were searching for World War II-era artifacts in the snowy woods of the Polish Jura when their metal detectors revealed an unexpected—and much rarer—item. Instead of ...

Instead of shell casings or coins, the two metal detectorists and history enthusiasts unearthed a three-foot-long Roman-era sword that dates back nearly 2,000 years. “We’d never found anything ...