Sønderborg Castle, Medieval castle in Sønderborg, Denmark
Sønderborg Castle sits on a small islet off Als island and features four wings with substantial stone walls overlooking the Als Fjord. The grounds contain multiple courtyards, passages, and chambers that reveal different construction periods.
King Valdemar I established the fortress in 1158 to secure Danish control against threats from the Baltic coast. It underwent major renovations and expansions later, especially during the Renaissance period.
The castle has long represented regional authority and continues to shape the character of Sønderborg today. Its courtyards and walls reflect its role as a significant administrative center for South Jutland across different periods.
The castle opens year-round with varying hours depending on the season. Comfortable shoes are recommended since the grounds are uneven and include multiple staircases to climb.
The castle chapel built between 1568 and 1570 ranks among Europe's earliest Protestant royal chapels and retains its original Renaissance interior. Visitors can see how religious architecture looked during this transformative period.
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