This incredible find was discovered by a diver involved in searching the Santa Margarita shipwreck from 1622 off the Florida Keys in June 2008. Michael DeMar thought he'd come across a discarded beer can when his metal detector beeped during the dive, yet amazingly he'd discovered a gold chalice that was lost in the shipwreck of the Santa Margarita. In August 2015, the chalice sold at auction in New York for $413,000 (£319k).

The greatest lost treasure in US history and the incredible story behind it

Incredible treasures found with metal detectors