Fort IJmuiden was built between 1879 and 1886 to protect the entrance to the North Sea Canal, the strategic waterway connecting Amsterdam to the North Sea. It is now an island, separated from the mainland by a branch of the canal dug in 1929, and it forms part of the UNESCO World Heritage Stelling van Amsterdam defensive ring. The fort's earthworks and distinctive armoured gallery survive largely intact.
During the Second World War, the Germans incorporated the fort into their Atlantic Wall coastal defences and removed its guns for use elsewhere — a common fate for Dutch fortifications. After the war it lost its military function and was designated a heritage site. The fort is now managed as an event and outdoor activity venue.
Access requires some planning — it is on an island and visits are typically organised through the management company. The structure is worth seeing for its unusual position in the landscape and as part of the broader context of 19th-century Dutch coastal defence. The surrounding waterway and shipping traffic make it a visually compelling spot.