- visitkoege.com koge/experiences/attractions/…Five historic Danish Viking age Ring Fortresses have just been added to the prestigious UNESCO World Heritage List.
- routeperfect.com denmark/trelleborg-viking-ring-…Dive into culture, history, activities and more in Trelleborg Viking Ring Fortress, Denmark. Start your adventure now!
- tripbucket.com dreams/dream/explore-viking-age-…These five archaeological sites comprise a system of monumental ring-shaped Viking-Age fortresses sharing a uniform geometric design.
- iflscience.com incredible-viking-ring-fortress-…clock-icon PUBLISHED August 17, 2017. Incredible Viking Ring Fortress Discovered In Denmark. Author. Josh Davis.
- dailymail.co.uk sciencetech/article-4778022/…Archaeologists use lasers to uncover a perfectly circular 1,000-year-old Viking ring fortress in Denmark - the first to be found in more than half a century.
- tripadvisor.com ShowUserReviews-g230032-d10406628…Vikingeborgen Borgring: Viking age Ring Fortress - See 16 traveler reviews, 15 candid photos, and great deals for Koege, Denmark, at Tripadvisor.
- WikiMili.com en/Viking_ring_fortressA Viking ring fortress, Trelleborg-type fortress, or trelleborg (pl. trelleborgs), is a type of circular fort of a special design, built in Scandinavia during the Viking Age.
- heritagedaily.com 2018/05/the-7-viking-ring-forts…The Trelleborg west of Slagelse on the Danish island of Zealand is arguably the best preserved of the Viking ring fortresses.