Kastellet, Copenhagen's star fortress
A star-shaped 17th-century fortress and military garrison, still in use, with ramparts, a windmill and a church.
Kastellet is a star-shaped fortress built in 1662-1664 under Frederik III to defend Copenhagen's northern flank. Five bastions form a regular pentagon surrounded by a moat, with barracks, a church, a windmill and a commandant's house inside. During the German occupation of 1940-45 the fortress was seized, and it remains an active military site. The ramparts are open to walkers and joggers year-round and the grounds lead directly to Langelinie and The Little Mermaid.
| Admission | Free |
|---|---|
| Hours | Open daily, approximately 06:00-22:00 |
| Address | Kastellet 1, 2100 Copenhagen O |
Why it matters
Built under Frederik III after the Swedish wars, Kastellet protected the northern approach to Copenhagen and is one of the best-preserved fortifications in Northern Europe.
Site facts
- Built
- 1662-1664
- Architect
- Henrik Ruse
- Style
- Star fortress
- UNESCO listing
- Not a UNESCO site
Location
Kastellet 1, 2100 Copenhagen O
55.6916, 12.5946 View on map
Highlights
- Ramparts walk
- Kastellet windmill
- Short walk to The Little Mermaid
Tips for visiting
- Parts of the garrison are closed to visitors
- Free to enter
When to visit
Late afternoon and evening for ramparts walks
Accessibility
Gravel paths and ramparts are mostly level; some ramp slopes exist.