![Viking ring fortress. Illustration of one of the circular Viking fortresses known as trelleborgs, the remains of which have been found in what is now Stock Photo - Alamy Viking ring fortress. Illustration of one of the circular Viking fortresses known as trelleborgs, the remains of which have been found in what is now Stock Photo - Alamy](https://c8.alamy.com/comp/2ADD3BN/viking-ring-fortress-illustration-of-one-of-the-circular-viking-fortresses-known-as-trelleborgs-the-remains-of-which-have-been-found-in-what-is-now-2ADD3BN.jpg)
Viking ring fortress. Illustration of one of the circular Viking fortresses known as trelleborgs, the remains of which have been found in what is now Stock Photo - Alamy
![Laser Tech Reveals 1,000-Year-Old Viking Ring Fortress in Denmark | Viking history, Norse, Viking age Laser Tech Reveals 1,000-Year-Old Viking Ring Fortress in Denmark | Viking history, Norse, Viking age](https://i.pinimg.com/originals/f3/fa/d9/f3fad984ea39fffc6f05ba02aab5ea4e.jpg)
Laser Tech Reveals 1,000-Year-Old Viking Ring Fortress in Denmark | Viking history, Norse, Viking age
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