Boeslunde is in Zealand, the large island that sits between mainland Denmark and the tip of Sweden. It’s a hotbed for archaeology in Denmark since it has served as a connective hub for thousands of years—netting recent finds as diverse as 1,000-year-old viking jewelry to actual fortresses in the past year. Boeslunde, where the spirals were discovered, is “a special sacred place in the Bronze Age where prehistoric people performed their rituals and offered gold to the higher powers,” according to the Danish National Museum’s curator, Flemming Kaul. The constant discovery of new gold around the area has spurred more...