This is a fantastic little site - well away from the main cities of the Netherlands so I'm sure the average tourist doesn't come here or even know about it.

The pumping station can still be used but it's just for emergencies now so you get to walk through the whole thing and see the machines from the inside and the building from the outside. There's an excellent and modern visitors centre where you start and you'll need to go with a guide (included in the ticket).

It's quite a beautiful building and learning about the technology is fascinating. Really worth the trip.