Copenhagen Castle Ruins
A queen repelled the Hanseatic fleet from this island in 1428 — the castle she defended now lies under Christiansborg's floor.
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The ruins beneath Christiansborg Palace preserve the footprint of Copenhagen's original seat of royal power, demolished from 1731 after Frederik IV's 1720s rebuild cracked its own walls under its weight. Seven centuries of fortress history compressed into one basement.
What to look for
- The moat outline, whose inner diameter ran roughly 50 meters
- The site of the Blue Tower — the large entrance gate where Christian IV added a spire and later used it as a prison
- The chapel foundations where organ-builder Hermann Rodensteen installed an instrument in 1556
The ruins are accessed through Christiansborg Palace on Slotsholmen island in central Copenhagen.
Copenhagen Castle Ruins is one of 35 sights worth the detour in Copenhagen, all bundled offline in Voyage GO — download the Copenhagen pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Copenhagen
- The Little MermaidAt 1.25 metres tall, she is smaller than almost every visitor expects — and that gap between legend and reality is the whole experience.
- Parken StadiumA 38,000-seat national football ground with a retractable roof and a three-Michelin-star restaurant on the eighth floor.
- AmalienborgFour matching palaces share one octagonal courtyard — and the Danish king actually lives in one.
- Tivoli GardensOpen since 1843 on a royal permit granted because, as the founder told the king, people busy having fun don't think about politics.
- Christiansborg PalaceThe only building on Earth where parliament, prime minister, and supreme court share one address — and the king still drops by.
- Rosenborg CastleA 1606 royal summerhouse that ended up storing the crown jewels and standing in as emergency palace twice.