Fort Rammenkens was build in 1547. In the link above you will find more information. You can visit the fort with and a guide can tell you everything about it.
Next to the fort there is a nature reserve, which is called the "Rammekenshoek", where it's beautiful to walk. Unfortunately, on the other side you have the industrial area which makes the view less beautiful.
You can find fort Rammekens in Ritthem, in the Netherlands.