When you are interested in military history, the fortresses of the defense line of Amsterdam are a must see.  Build around 1900, it consists of some 46 fortresseses, batteries, dikes, dams and locks. The enemy was partly kept out by inundating the land outside the defense line. The invention of the airplane was a real spoiler for military strategists... 

Note: this fortress, Bastion de Bakkerschans, is not open to the public, but many other fortresses are. http://www.stellingvanamsterdam.nl/en/home
When you are interested in military history, the fortresses of the defense line of Amsterdam are a must see.  Build around 1900, it consists of some 46 fortresseses, batteries, dikes, dams and locks. The enemy was partly kept out by inundating the land outside the defense line. The invention of the airplane was a real spoiler for military strategists... 

Note: this fortress, Bastion de Bakkerschans, is not open to the public, but many other fortresses are. http://www.stellingvanamsterdam.nl/en/home
With a windmill around the corner, one cannot get more Holland then this

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