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Forts, strongholds and bunkers: visit them near Haarlem this weekend

Forts, strongholds and bunkers: visit them near Haarlem this weekend

The National Defense Heritage Weekend on April 18 and 19 allows visitors to explore various forts, bunkers, and fortifications near Haarlem and throughout the Netherlands. Many participating locations will offer free entry or host special activities during the two-day event.

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