Kastellet
A pentagon of turf ramparts from 1626 that the Danish army still actually uses — and you can walk straight through it.
Coming soon on iOS — be first to walk Copenhagen offline.
One of the best-preserved fortresses in Northern Europe, Kastellet lets you trace five full bastioned ramparts built to defend Copenhagen from Swedish siege in the 1650s. On 9 April 1940, German troops took the entire citadel without resistance. Painter Christen Købke grew up inside these walls during the Golden Age of Danish painting and spent his career recording what he saw here.
What to look for
- The windmill standing inside the ramparts — an unexpected sight inside a military fortification
- The Citadel Church, one of the original structures within the grounds
- The pentagonal layout itself: walk the outer rampart to see how all five bastions connect
Kastellet functions as a public park and historic site, but active military operations continue inside — some buildings are off-limits to visitors.
Kastellet 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.