Kasteel Doornenburg, Doornenburg, the Netherlands
Castle Doornenburg (or Kasteel Doornenburg in Dutch) is a Dutch castle from the 13th century and a nice outing to do with children. You can only visit the Castle museum during guided tours.
The castle is located in the eastern part of the province of Gelderland, near the village of Doornenburg. It is one of the biggest and most well-preserved castles in the Netherlands.
Open on Wednesday, Saturday and Sunday, but for the hours and guided tours you should check their calendar.