Thousand-year-old Viking fortress reveals a technologically advanced society, Science

The Complete History of the Vikings - Life in Norway

Lifting the Lid on Antarctica: Ancient Landscape Revealed Beneath Antarctica

2500-Year-Old Technology and an Ancient Kitchen Unearthed at Harput Castle

Viking Age - Wikipedia

World's Oldest Fortress Discovered in Siberia Challenges Traditional Archaeology

New Season of Unearthed Premieres Tuesday, An enormous fort built by vikings, Trelleborg is a geometrically perfect circle., By Science Channel

Did Vikings ever build stone castles? - Quora

Thousand-year-old Viking fortress reveals a technologically advanced society, Science

Oregon could be oldest site of human occupation in North America, UO find indicates

Researchers are trying to solve a Danish castle mystery

An Archaeological Needle in the Haystack: The Viking Village of Kaupang

Viking Age Dental Care Was Surprisingly Good, Says Study