An old map believed to mark the spot where German soldiers hid treasure worth millions of dollars during World War II sparked the imagination of amateur treasure hunters in the Netherlands this week. Armed with metal detectors and shovels, groups wandered through the fields surrounding rural Ommeren in the east of the country after the map was made public by the Dutch National Archive on Tuesday. The archive said the map was believed to indicate where Nazi soldiers had hidden four large boxes filled with diamonds, rubies, gold, silver and all sorts of jewelry which they had looted after an...