Trøjborg, Medieval castle ruin in Tønder Municipality, Denmark.
Trøjborg is a medieval castle ruin positioned on a rectangular mound approximately 30 by 30 meters in size. Preserved sections of the south wall and underground basement structures remain visible, revealing how the fortress was originally built.
The castle was built around 1300 and passed from Duke Valdemar to Queen Margaret in 1407 before later being transferred to Daniel Rantzau. In 1580, Peter Rantzau replaced the medieval structure with a Renaissance castle incorporating Dutch architectural elements.
The name Trøjborg comes from the Danish word for fortification, reflecting its medieval roots. You can still see the layout of the rooms and halls where residents once moved through their daily lives.
You can visit the ruins for free, with access available from 8 in the morning until sunset. A parking area is located about 500 meters away, making it easy to reach the site on foot.
Underground prison cells lie beneath the ruins, revealing how prisoners were once confined in this fortress. The structure was built using Renaissance bricks placed on a granite foundation with stair towers positioned at each corner of the courtyard.
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