Somewhat surprisingly for such notable historic monuments ... in the popular TV series, Vikings. Once Sweden had converted to Christianity, Old Uppsala remained a site of religious importance.

However, in the centuries since the Vikings used the site, it has been plowed ... the news release from Arkeologerna and Sweden’s National Historical Museums.

At Fröjel, a Viking Age site on the west coast of Gotland ... (Photo by: Ny Björn Gustafsson/The Swedish History Museum) Traces of lead and other impurities were found embedded in pieces ...