Because I was born and raised in Amsterdam and aware of at least 3 surviving windmills inside the city's boundaries,
especially mill 'De Gooijer' a few kilometers from my parental home:
Molen 'De Gooijer' 1 , and what it is today: Molen 'De Gooijer' 2

The song in Dutch was made famous by early TV personality Rudi Carrell, here's a video:
Een muis in een molen