Thieves blow up museum door and steal ancient artifacts, including 2,500-year-old gold helmet

The 5th-century BC Helmet of Cotofenesti was among the valuable items taken during an overnight heist at Drents Museum in the Netherlands.

​ The 5th-century BC Helmet of Cotofenesti was among the valuable items taken during an overnight heist at Drents Museum in the Netherlands. Read More Breaking News, Latest News and Videos | CNN