Hammershus is a historic medieval fortress located near Allinge-Sandvig on the island of Bornholm in Denmark. It is the largest castle ruin in Northern Europe and dates back to the early 13th century. The fortress served as a key stronghold in the region, with a strategic position overlooking the Baltic Sea. Its extensive ruins include a large wall, towers, and various buildings, which provide a glimpse into medieval architecture and history.
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