🇩🇰 Denmark · Fortress
Gamleborg
Gamleborg, also known as Gamleborg Viking Fortress, was the first fortification on the Danish island of Bornholm.
🇩🇰 Denmark · Fortress
Borgring
Borgring (older spelling Borrering) also known as Vallø Borgring, is a Danish Viking ring fortress located near Køge on the island of Zealand.