The Kroontjesbunker: secret command center in the dunes
The FL250 Flakgruppenkommandostand, nicknamed Kroontjesbunker, lies hidden in the dunes of Huisduinen. The bunker owes its nickname to the striking shape of the tower, which resembles a crown.
Track flight movements with precision
Air raids were coordinated in the bunker during the Second World War. Using a glass plotter wall, soldiers relayed flight movements to anti-aircraft positions. The data came from radar stations along the coast and from positions further afield, such as Zandvoort and Terschelling. This created a chain of observation points that could accurately track every flight movement.
In recovery: future museum in the making
Three dedicated volunteers are working on restoring the bunker to its original state. The goal is to turn the Kroontjesbunker into a small-scale museum. The interior still exudes the atmosphere of a high-pressure command center.
Mammoth radar
Discover the Mammut radar in the Kroontjesbunker and dive into a remarkable piece of war history. View a miniature version or a special presentation of this German radar system. You will discover how this advanced radar operated during World War II.
The Mammut FuMG 42 had an enormous fixed antenna wall. This allowed aircraft to be detected up to approximately 300 kilometers away. During your visit, you will learn more about this remarkable warfare technology.
Can be visited on selected days
The bunker is open to the public only a few times a year. Check the Flak Gruko Facebook page for current opening times and updates. Tip: bring a flashlight for better visibility in the dark rooms.
Watch your route – and the nature reserve
The Kroontjesbunker is located in a protected nature reserve. Therefore, please stay on the marked walking paths. Respect the nature and the silence of this special place.
This is how you reach the Kroontjesbunker
- By car: Park at Fort Kijkduin (Admiraal Verhuellplein 1, 1789 AX Huisduinen). From there, follow the signs towards the bunker.
- By bike or on foot: Take the side street off Duinweg (at number 34, in front of Hotel The Baron Crown). Signs will guide you here as well.
Opening hours
- Saturday, September 12: 10:00 – 17:00
- Sunday, September 13: 10:00 – 17:00
Background information
- Type of monument: Defensive structure
- Original function: German Air Defense Headquarters
- Construction period: 1944
- Current function: Crown Bunker
