Due to their close proximity to the strategic port of IJmuiden, the dunes just south of Zandvoort were heavily fortified by the Nazis during World War II. As part of the Atlantic Wall defence system, the German occupiers built several anti-aircraft guns and hundreds of bunkers in the Amsterdamse Waterleidingduinen area. Most of the Nazi bunkers are now covered by sand, but enthusiastic local guides know how to find these concrete remnants of the war and provide historical details for anyone who wants to listen. You can go inside several bunkers, including a former commanders’ bunker, and the beautiful nature park itself is worth the visit, but today you'll probably see an occupier of another sort: deer. Guided tours start every Thursday at 10:30 at the entrance gate of the nature park next to the Duinrand restaurant. Bus No.80 stops right in front of the restaurant at the Waterleiding/Nieuw Unicum stop. The tour can be booked at the Zandvoort tourist office.