Forts in Denmark

Fredericia () is a town located in Fredericia Municipality in the southeastern part of the Jutland peninsula in Denmark. The city is part of the Triangle Region, which includes the neighbouring cities of Kolding and Vejle. It was founded in 1650 by Frederick III, after whom it was named.

Kronborg () is a castle and historical stronghold in the town of Helsingør, Denmark. Immortalised as Elsinore in William Shakespeare's play Hamlet, Kronborg is one of the most important Renaissance castles in Northern Europe. It was inscribed on the UNESCO World Heritage List in 2000.

Samsø (Anglicized: "Samso" or "Samsoe") is a Danish island in the Kattegat off the Jutland Peninsula. Samsø is located in Samsø municipality. The community has 3,724 inhabitants (2017) (January 2010: 4,010) called Samsings and is in area. Due to its central location, the island was used during the Viking Age as a meeting place. The etymology of the island's name is unknown.

type of circular fort built in Scandinavia in the Viking Age

Ertholmene (formerly spelled Ærtholmene) is a small archipelago in Denmark. The largest island is Christiansø, whose name is often used with reference to the entire archipelago. Ertholmene are situated northeast of Gudhjem, Bornholm, and include Denmark's easternmost point. Two of the islands, Christiansø and Frederiksø, are inhabited, with a combined permanent population () of 90. The archipelago has a total area of . Its name is derived from the Danish for "pea islands".

thumb|Hammershus thumb|Hammershus

Aggersborg is the largest of Denmark's former Viking ring fortress, and one of the largest archaeological sites in Denmark. It is located near Aggersund on the north side of the Limfjord. It consists of a circular rampart surrounded by a ditch. Four main roads arranged in a cross connects the fortress center with the rampart's outer ring. The roads were tunneled under the outer rampart, leaving the circular structure intact. Many archaeological excavations have been conducted on the site, revealing its original structure and design. These excavations also uncovered a large number of artefacts

circular viking fort in Denmark

Fyrkat is a former Viking ring castle in Denmark, dating from c. 980 AD. It is located near the town of Hobro, some distance from the present end of the Mariager Fjord in Northern Jutland. The fortress is built on a narrow piece of land, with a stream on one side and swampy area on the other sides. Likely built during the reign of Harald Gormsson or his son Sweyn Forkbeard, the fortress may have served as barracks or as a defensive stronghold. It would have help to enable control of the traffic on the main land-based trading route between Aalborg and Aarhus. Because of its unique architecture

thumb|300px|Koldinghus from the north thumb|300px|Koldinghus seen from over Slotssøen

Masnedø () is a Danish island between Zealand and Falster. The island covers an area of 1.68 km2 and has 156 inhabitants.

Nonnebakken (literally, "The Nun Hill") is a hill in Odense, Denmark. It is the site of one of Denmark's six former Viking ring castles, built during the reign of Sweyn Forkbeard, who had forced his father Harold Bluetooth to leave the country and seek refuge with the Jomsvikings on Wollin (modern Poland) around 975. The fort enabled its occupier to control the Odense River passing next to the hill.

thumb|right|250 px|Gamleborg Almindingen trail thumb|right|250 px|Gamleborg stonewall thumb|right|250 px| Gamleborg entrance

Borremose is a raised bog in central Himmerland, Denmark south east of the town of Aars. The name translates directly as 'Borre'-bog, where 'Borre' might well be a derivation of the old word burgh meaning fortified place, as seen in many other place-names.

fort in Denmark

thumb|Krudttårnet

rampart, Fortifications of Copenhagen (17th century)

thumb|Christianspris Christianspris or Frederiksort was a Danish fortification somewhat north of the then Danish city of Kiel. In 1632 the Danish king Christian IV initiated the works of making a fortification on a land tongue on the West shore of the Kielerfiord on the Jernved peninsula. The purpose was to secure this land against German troops during the 30-years War. However, the town was short lived. Christian IV founded many towns and cities. The town is notable for being captured by the Swedes during the Torstenson War during the Jutland Campaign in January of 1644

Borgring (older spelling Borrering) also known as Vallø Borgring, is a Danish Viking ring fortress located near Køge on the island of Zealand. Likely built around 970 or 980, the fortress may have been built to defend trade routes or as a military barracks. In 2023, along with four other Viking ring fortresses, Borgring was isncribed on the UNESCO World Heritage List for its unique architecture and testimony to the strategic and military power of the House of Knýtlinga (Jelling dynasty).