Discover Denmark's Viking Age Ring-Shaped Fortresses

Discover the five ring-shaped Viking fortresses that were built during the early Middle Ages in Denmark as either trading posts or military bases.

Borgring, Vikingeborgen ved Køge

Trelleborgen - Viking fortress in Trelleborg

Trelleborg Viking Fortress, Denmark

Danish Viking King Harald Bluetooth built a network of ring fortresses. Why?

5 Danish ring fortresses were recently named world heritage by UNESCO

Denmark's Viking Ring Fortresses Will Be Europe's Next Big Attraction

Trelleborg Viking Fortress, Denmark

25 Fortress Of Trelleborg Stock Photos, High-Res Pictures, and Images - Getty Images

New discovery could rewrite Viking fortresses' history

Denmark's Viking Ring Fortresses Will Be Europe's Next Big Attraction

Viking-Age Ring Fortresses - UNESCO World Heritage Centre

Discover Denmark's Viking Age Ring-Shaped Fortresses